diff --git a/.gitignore b/.gitignore
index 36b13f1..86da080 100644
--- a/.gitignore
+++ b/.gitignore
@@ -174,3 +174,4 @@ cython_debug/
 # PyPI configuration file
 .pypirc
 
+.idea
diff --git a/README.md b/README.md
index fa364d8..7b249e9 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,64 @@
-# kpmatch
+# kpmatch - Path patterns
 
+## Pattern Syntax
+
+Path patterns should always use forward slashes `/` between segments.
+The actual separator used when matching paths depends on the system.
+
+A path segment containing two asterisks `/**/` matches zero, one or more
+segments.
+
+A single asterisk `*` matches zero, one or more characters except a path
+separator.
+
+A question mark `?` matches exactly one character unless it's a path
+separator.
+
+Square brackets `[ ]` can match one of the characters between the brackets.
+If the first character is an exclamation point `[! ]`, it will match one
+character that does NOT appear between the brackets.
+
+Curly braces `{ , }` can match one of the sub-expressions separated by commas.
+
+## API
+
+### Function `kpmatch.kpmatch(path: str | PathLike[str], pattern: str) -> bool`
+
+### Method `kpmatch.Pattern.match(path: str | PathLike[str]) -> bool`
+
+Tests if a path matches a pattern.
+
+<dl>
+    <dt>Parameters</dt>
+    <dd>
+        <strong>path</strong> — A relative or absolute file path.<br/>
+        <strong>pattern</strong> — A path pattern (see above for the syntax of patterns).
+    </dd>
+    <dt>Returns</dt>
+    <dd>True if the path matches the pattern.</dd>
+</dl>
+
+```
+function kpmatch.specificity(pattern: str) -> float
+property kpmatch.Pattern.specificity: bool
+```
+
+Computes the specificity of a pattern. The higher the number, the more
+specific it is.
+:param pattern: The path pattern to evaluate.
+:return: A positive integer.
+
+```python
+def compile(pattern: str) -> Pattern
+```
+
+Compiles a pattern into a Pattern object that can be reused multiple times.
+:param pattern: The path pattern to compile.
+
+```python
+def is_valid_pattern(pattern: str) -> bool
+```
+
+Verifies the syntax of a pattern.
+:param pattern: The path pattern to check.
+:return: True if the pattern is well-formed.
diff --git a/kpmatch/__init__.py b/kpmatch/__init__.py
new file mode 100644
index 0000000..efd9044
--- /dev/null
+++ b/kpmatch/__init__.py
@@ -0,0 +1,96 @@
+"""
+kpmatch - Path glob matching functions
+"""
+
+import os.path
+from os import PathLike
+
+from kpmatch.matchers import PathMatcher
+from kpmatch.parse import _parse_pattern, PatternParsingError
+
+
+class Pattern:
+    """
+    Represents a path pattern. Use kpmatch.compile(...) to create instances of
+    this class.
+    """
+
+    __first_segment: "PathMatcher"
+
+    def __init__(self, first_segment: "PathMatcher"):
+        self.__first_segment = first_segment
+
+    def match(self, path: str):
+        normalised_path = os.path.normcase(path)
+        return self.__first_segment.match(normalised_path, 0)
+
+    @property
+    def specificity(self) -> int:
+        """
+        The specificity of this pattern. The higher the number, the more
+        specific it is.
+        :return: A positive integer.
+        """
+
+        # if bit 1 is set, there is a fixed segment
+        # if bit 2 is set, there is fixed-length wildcard (either ?, [] or {})
+        # if bit 3 is set, there is * wildcard
+        # if bit 3 is set, there is ** wildcard
+        mask = self.__first_segment.generate_wildness_mask()
+        spec = 0
+        for n in (1, 2, 4, 8):
+            if (mask & n) == 0:
+                # if there is no segment of wildness n...
+                if spec > 0:
+                    # ... add n so that it is always more specific than any
+                    # pattern with such a segment
+                    spec += n
+                # if spec is 0, we stay at 0 until we find
+                # the most specific segment
+            else:
+                # if there is a segment of wildness n,
+                # add 1 so that it is a little bit more specific
+                spec += 1
+        return spec
+
+
+def compile(pattern: str) -> Pattern:
+    """
+    Compiles a pattern into a Pattern object that can be reused multiple times.
+    :param pattern: The path pattern to compile.
+    """
+    normalised_pattern = os.path.normcase(pattern)
+    return Pattern(_parse_pattern(normalised_pattern))
+
+
+def kpmatch(path: str | PathLike[str], pattern: str) -> bool:
+    """
+    Tests if a path matches a pattern.
+    :param path: A relative or absolute file path.
+    :param pattern: A path pattern (see the README for the syntax of patterns).
+    :return: True if the path matches the pattern.
+    """
+    return compile(pattern).match(path)
+
+
+def is_valid_pattern(pattern: str) -> bool:
+    """
+    Verifies the syntax of a pattern.
+    :param pattern: The path pattern to check.
+    :return: True if the pattern is well-formed.
+    """
+    try:
+        compile(pattern)
+        return True
+    except PatternParsingError:
+        return False
+
+
+def specificity(pattern: str) -> float:
+    """
+    Computes the specificity of a pattern. The higher the number, the more
+    specific it is.
+    :param pattern: The path pattern to evaluate.
+    :return: A positive integer.
+    """
+    return compile(pattern).specificity
diff --git a/kpmatch/matchers.py b/kpmatch/matchers.py
new file mode 100644
index 0000000..2d53dd5
--- /dev/null
+++ b/kpmatch/matchers.py
@@ -0,0 +1,251 @@
+import os.path
+from abc import ABC, abstractmethod
+from collections.abc import Iterable
+from typing import Optional
+
+
+class PathMatcher(ABC):
+    __next: Optional["PathMatcher"]
+
+    def __init__(self):
+        self.__next = None
+
+    def __eq__(self, other):
+        return isinstance(other, PathMatcher) and other.__next == self.__next
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}({self._repr_attrs()})" + (
+            " & " + repr(self.__next) if self.__next is not None else ""
+        )
+
+    def _repr_attrs(self):
+        return ""
+
+    def set_next(self, matcher: "PathMatcher"):
+        self.__next = matcher
+
+    def append(self, matcher: "PathMatcher") -> "PathMatcher":
+        if self.__next is None:
+            self.set_next(matcher)
+        else:
+            self.__next.append(matcher)
+        return self.__next
+
+    def match_next(self, path: str, start: int) -> bool:
+        if self.__next is None:
+            raise RuntimeError("match_next called at EOP")
+        return self.__next.match(path, start)
+
+    @abstractmethod
+    def match(self, path: str, start: int) -> bool: ...
+
+    def generate_wildness_mask(self) -> int:
+        if self.__next is None:
+            return 0
+        else:
+            return self.wildness | self.__next.generate_wildness_mask()
+
+    @property
+    @abstractmethod
+    def wildness(self) -> int: ...
+
+
+class AnySegments(PathMatcher):
+    """
+    Matches zero, one or more segments. This represents the ** wildcard.
+    """
+
+    def match(self, path: str, start: int) -> bool:
+        last_sep = prefix = len(path)
+        match = False
+        while not match and prefix > start:
+            match = self.match_next(path, prefix)
+            if not match:
+                # backtrack by removing an entire segment from the prefix
+                last_sep = path.rfind(os.path.sep, start, last_sep)
+                prefix = start if last_sep == -1 else last_sep + len(os.path.sep)
+        # last try without consuming anything
+        if not match:
+            match = self.match_next(path, prefix)
+        return match
+
+    @property
+    def wildness(self) -> int:
+        return 8
+
+
+class AnyName(PathMatcher):
+    """
+    Matches any filename. This represents the * wildcard.
+    """
+
+    def match(self, path: str, start: int) -> bool:
+        next_sep = path.find(os.path.sep, start)
+        prefix = len(path) if next_sep == -1 else next_sep
+        match = False
+        while not match and prefix >= start:
+            match = self.match_next(path, prefix)
+            if not match:
+                prefix -= 1
+        return match
+
+    @property
+    def wildness(self) -> int:
+        return 4
+
+
+class OneOf(PathMatcher):
+    """
+    Matches any of the sub-expressions.
+    """
+
+    __matchers: tuple["PathMatcher", ...]
+
+    def __init__(self, matchers: Iterable["PathMatcher"]):
+        super().__init__()
+        self.__matchers = tuple(matchers)
+
+    def __eq__(self, other):
+        return (
+            super().__eq__(other)
+            and isinstance(other, OneOf)
+            and other.__matchers == self.__matchers
+        )
+
+    def _repr_attrs(self):
+        return "(" + ", ".join(repr(m) for m in self.__matchers) + ")"
+
+    def append(self, matcher: "PathMatcher") -> "PathMatcher":
+        next_matcher = super().append(matcher)
+        for choice_matcher in self.__matchers:
+            choice_matcher.set_next(next_matcher)
+        return next_matcher
+
+    def match(self, path: str, start: int) -> bool:
+        match = False
+        for choice_matcher in self.__matchers:
+            match = choice_matcher.match(path, start)
+            if match:
+                break
+        return match
+
+    @property
+    def wildness(self) -> int:
+        return 2
+
+
+class AnyCharacter(PathMatcher):
+    """
+    Matches a single character. This represents the ? wildcard.
+    """
+
+    def __eq__(self, other):
+        return super().__eq__(other) and isinstance(other, AnyCharacter)
+
+    def match(self, path: str, start: int) -> bool:
+        return start < len(path) and self.match_next(path, start + 1)
+
+    @property
+    def wildness(self) -> int:
+        return 2
+
+
+class CharacterSet(PathMatcher):
+    """
+    Matches any/none of the characters in a set.
+    """
+
+    __set: str
+    __negation: bool
+
+    def __init__(self, character_set: str, negation: bool):
+        super().__init__()
+        self.__set = character_set
+        self.__negation = negation
+
+    def __eq__(self, other):
+        return (
+            super().__eq__(other)
+            and isinstance(other, CharacterSet)
+            and other.__set == self.__set
+            and other.__negation == self.__negation
+        )
+
+    def _repr_attrs(self):
+        return repr(self.__set) + ", " + repr(self.__negation)
+
+    def match(self, path: str, start: int) -> bool:
+        return (
+            start < len(path)
+            and (self.__set.find(path[start]) == -1) == self.__negation
+            and self.match_next(path, start + 1)
+        )
+
+    @property
+    def wildness(self) -> int:
+        return 2
+
+
+class FixedName(PathMatcher):
+    """
+    Matches a fixed filename.
+    """
+
+    __text: str
+
+    def __init__(self, text: str):
+        super().__init__()
+        self.__text = text
+
+    def __eq__(self, other):
+        return (
+            super().__eq__(other)
+            and isinstance(other, FixedName)
+            and other.__text == self.__text
+        )
+
+    def _repr_attrs(self):
+        return repr(self.__text)
+
+    def match(self, path: str, start: int) -> bool:
+        return path.startswith(self.__text, start) and self.match_next(
+            path, start + len(self.__text)
+        )
+
+    @property
+    def wildness(self) -> int:
+        return 1
+
+
+class EndOfSegment(PathMatcher):
+    """
+    Matches the end of a single segment.
+    """
+
+    def __init__(self):
+        super().__init__()
+
+    def match(self, path: str, start: int) -> bool:
+        if start >= len(path):
+            return self.match_next(path, start)
+        else:
+            return path.startswith(os.path.sep, start) and self.match_next(
+                path, start + len(os.path.sep)
+            )
+
+    @property
+    def wildness(self) -> int:
+        return 0
+
+
+class EndOfPath(PathMatcher):
+    """
+    Matches the end of the string.
+    """
+
+    def match(self, path: str, start: int) -> bool:
+        return start >= len(path)
+
+    @property
+    def wildness(self) -> int:
+        return 0
diff --git a/kpmatch/parse.py b/kpmatch/parse.py
new file mode 100644
index 0000000..ab2b3e6
--- /dev/null
+++ b/kpmatch/parse.py
@@ -0,0 +1,265 @@
+import os.path
+from typing import Optional, Never
+
+from kpmatch.matchers import (
+    PathMatcher,
+    EndOfPath,
+    AnySegments,
+    AnyName,
+    FixedName,
+    CharacterSet,
+    AnyCharacter,
+    OneOf,
+    EndOfSegment,
+)
+
+
+class PatternParsingError(ValueError):
+    def __init__(self, message, pattern, position):
+        super().__init__(f'{message} at position {position} in pattern "{pattern}"')
+
+
+def _append(a: Optional[PathMatcher], b: PathMatcher) -> PathMatcher:
+    if a is None:
+        return b
+    else:
+        a.append(b)
+        return a
+
+
+def _parse_pattern(pattern: str) -> PathMatcher:
+    # pattern <- (any_segments / fixed_segment)*
+    i = 0
+    first = None
+    while i < len(pattern):
+        (segment, i) = _parse_any_segments(pattern, i)
+        if segment is None:
+            (segment, i) = _parse_fixed_segment(pattern, i)
+        if segment is None:
+            raise PatternParsingError(
+                f'unexpected character "{pattern[i]}"', pattern, i
+            )
+        first = _append(first, segment)
+    first = _append(first, EndOfPath())
+    return first
+
+
+def _parse_any_segments(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # any_segments <- "**" (SEP / EOS)
+    i = start
+    matcher = None
+    if pattern.startswith("**", i):
+        i += 2
+        if pattern.startswith(os.path.sep, i):
+            i += len(os.path.sep)
+            matcher = AnySegments()
+        elif i == len(pattern):
+            matcher = AnySegments()
+        else:
+            i = start
+    return matcher, i
+
+
+def _raise_unexpected_name_part_error(pattern: str, start: int) -> Never:
+    if pattern.startswith(os.path.sep, start):
+        message = "Empty path segment"
+    elif pattern.startswith("[", start):
+        message = 'Missing closing bracket "]" to match "["'
+    elif pattern.startswith("{", start):
+        message = 'Missing closing bracket "}" to match "{"'
+    else:
+        message = f'unexpected character "{pattern[start]}"'
+    raise PatternParsingError(message, pattern, start)
+
+
+def _parse_fixed_segment(pattern: str, start: int) -> tuple[PathMatcher, int]:
+    # fixed_segment <- name_part+ (SEP / EOS)
+    # consume at least one part
+    (first, i) = _parse_name_part(pattern, start)
+    if first is None:
+        _raise_unexpected_name_part_error(pattern, i)
+    ended = False
+    while not ended and i < len(pattern):
+        # stop if we encounter a path separator
+        if pattern.startswith(os.path.sep, i):
+            i += len(os.path.sep)
+            ended = True
+        # parse the next part otherwise
+        else:
+            (other, i) = _parse_name_part(pattern, i)
+            if other is None:
+                _raise_unexpected_name_part_error(pattern, i)
+            first = _append(first, other)
+    first = _append(first, EndOfSegment())
+    return first, i
+
+
+def _parse_name_part(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # name_part <- any_name / one_of / simple_name_part / ","
+    i = start
+    (part, i) = _parse_any_name(pattern, i)
+    if part is None:
+        (part, i) = _parse_one_of(pattern, i)
+    if part is None:
+        (part, i) = _parse_simple_name_part(pattern, i)
+    if part is None:
+        if pattern.startswith(",", i):
+            i += 1
+            part = FixedName(",")
+    return part, i
+
+
+def _parse_any_name(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # any_name = "*"+
+    i = start
+    matcher = None
+    while pattern.startswith("*", i):
+        i += 1
+        matcher = AnyName()
+    return matcher, i
+
+
+def _raise_error_in_one_of(pattern: str, start: int) -> bool:
+    if pattern.startswith("{", start):
+        raise PatternParsingError(
+            'Character "{" is not allowed inside a one-of pattern',
+            pattern,
+            start,
+        )
+    if pattern.startswith("*", start):
+        raise PatternParsingError(
+            'A star "*" wildcard is not allowed inside a one-of pattern',
+            pattern,
+            start,
+        )
+
+
+def _parse_one_of(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # one_of = "{" one_of_choice ("," one_of_choice)* "}"
+    i = start
+    matcher = None
+    if pattern.startswith("{", i):
+        i += 1
+        ended = False
+        choices = []
+
+        _raise_error_in_one_of(pattern, i)
+        (choice, j) = _parse_one_of_choice(pattern, i)
+        choices.append((choice, i))
+        i = j
+
+        while not ended and i < len(pattern):
+            _raise_error_in_one_of(pattern, i)
+            if pattern.startswith(",", i):
+                i += 1
+                _raise_error_in_one_of(pattern, i)
+                (choice, j) = _parse_one_of_choice(pattern, i)
+                choices.append((choice, i))
+                i = j
+            else:
+                ended = True
+
+        if pattern.startswith("}", i):
+            i += 1
+            choice_matchers = []
+            for choice_matcher, choice_start in choices:
+                if choice_matcher is None:
+                    raise PatternParsingError(
+                        "Empty choice in a one-of pattern", pattern, choice_start
+                    )
+                else:
+                    choice_matchers.append(choice_matcher)
+            matcher = OneOf(choice_matchers)
+        else:
+            i = start
+    return matcher, i
+
+
+def _parse_one_of_choice(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # one_of_choice = simple_name_part+
+    i = start
+    first = None
+    ended = False
+    while not ended and i < len(pattern):
+        (segment, i) = _parse_simple_name_part(pattern, i)
+        if segment is None:
+            ended = True
+        else:
+            first = _append(first, segment)
+    return first, i
+
+
+def _parse_simple_name_part(
+    pattern: str, start: int
+) -> tuple[Optional[PathMatcher], int]:
+    # simple_name_part = any_character / character_set / fixed_name
+    i = start
+    (part, i) = _parse_any_character(pattern, i)
+    if part is None:
+        (part, i) = _parse_character_set(pattern, i)
+    if part is None:
+        (part, i) = _parse_fixed_name(pattern, i)
+    return part, i
+
+
+def _parse_any_character(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # any_character = "?"
+    i = start
+    matcher = None
+    if pattern.startswith("?", i):
+        i += 1
+        matcher = AnyCharacter()
+    return matcher, i
+
+
+def _is_allowed_in_character_set(pattern: str, start: int) -> bool:
+    return not pattern.startswith(os.path.sep, start) and pattern[start] != "]"
+
+
+def _is_immediate_error_in_character_set(pattern: str, start: int) -> bool:
+    return pattern[start] == "!" or pattern[start] == "["
+
+
+def _parse_character_set(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # character_set = "[" "!"? (!("[" / "!" / "]" / SEP) .)+ "]"
+    i = start
+    matcher = None
+    if pattern.startswith("[", i):
+        i += 1
+        negation = False
+        if pattern.startswith("!", i):
+            i += 1
+            negation = True
+        set_start = i
+        while i < len(pattern) and _is_allowed_in_character_set(pattern, i):
+            if _is_immediate_error_in_character_set(pattern, i):
+                raise PatternParsingError(
+                    f'Character "{pattern[i]}" is not allowed inside a character set',
+                    pattern,
+                    i,
+                )
+            i += 1
+        if i > set_start and pattern.startswith("]", i):
+            matcher = CharacterSet(pattern[set_start:i], negation)
+            i += 1
+        else:
+            i = start
+    return matcher, i
+
+
+def _is_allowed_in_fixed_name(pattern: str, start: int) -> bool:
+    return (
+        _is_allowed_in_character_set(pattern, start)
+        and "[!]*{,}?".find(pattern[start]) == -1
+    )
+
+
+def _parse_fixed_name(pattern: str, start: int) -> tuple[Optional[PathMatcher], int]:
+    # fixed_name = (!("[" / "!" / "]" / SEP / "*" / "?" / "{" / "}" / ",") .)+
+    i = start
+    matcher = None
+    while i < len(pattern) and _is_allowed_in_fixed_name(pattern, i):
+        i += 1
+    if i > start:
+        matcher = FixedName(pattern[start:i])
+    return matcher, i
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..5973110
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,325 @@
+# This file is automatically @generated by Poetry 2.1.2 and should not be changed by hand.
+
+[[package]]
+name = "black"
+version = "25.11.0"
+description = "The uncompromising code formatter."
+optional = false
+python-versions = ">=3.9"
+groups = ["dev"]
+files = [
+    {file = "black-25.11.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:ec311e22458eec32a807f029b2646f661e6859c3f61bc6d9ffb67958779f392e"},
+    {file = "black-25.11.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:1032639c90208c15711334d681de2e24821af0575573db2810b0763bcd62e0f0"},
+    {file = "black-25.11.0-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:0c0f7c461df55cf32929b002335883946a4893d759f2df343389c4396f3b6b37"},
+    {file = "black-25.11.0-cp310-cp310-win_amd64.whl", hash = "sha256:f9786c24d8e9bd5f20dc7a7f0cdd742644656987f6ea6947629306f937726c03"},
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+content-hash = "2afe710a5499b666d6de8a1b2f1427995d8e5597cbf0fa7caeff697e9a391d00"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..8e6bf74
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,21 @@
+[project]
+name = "kpmatch"
+version = "0.1.0"
+description = ""
+authors = [
+    {name = "Louis DEVIE",email = "contact@louisdevie.fr"}
+]
+readme = "README.md"
+requires-python = ">=3.10"
+dependencies = [
+]
+
+
+[build-system]
+requires = ["poetry-core>=2.0.0,<3.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.group.dev.dependencies]
+black = "^25.11.0"
+coverage = "^7.11.3"
+
diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 0000000..777050e
--- /dev/null
+++ b/test/__init__.py
@@ -0,0 +1,3 @@
+from .match import MatchTests
+from .parse import ParseTests
+from .specificity import SpecificityTests
diff --git a/test/match.py b/test/match.py
new file mode 100644
index 0000000..19ac140
--- /dev/null
+++ b/test/match.py
@@ -0,0 +1,74 @@
+from unittest import TestCase
+
+import kpmatch
+
+
+class MatchTests(TestCase):
+    def test_match_empty(self):
+        pattern = kpmatch.compile("")
+        self.assertTrue(pattern.match(""))
+        self.assertFalse(pattern.match("index.html"))
+        self.assertFalse(pattern.match("about"))
+        self.assertFalse(pattern.match("about/about.html"))
+        self.assertFalse(pattern.match("content/deep/deeper/file.txt"))
+
+    def test_match_any(self):
+        pattern = kpmatch.compile("**")
+        self.assertTrue(pattern.match(""))
+        self.assertTrue(pattern.match("index.html"))
+        self.assertTrue(pattern.match("about"))
+        self.assertTrue(pattern.match("about/about.html"))
+        self.assertTrue(pattern.match("content/deep/deeper/file.txt"))
+
+    def test_match_any_name(self):
+        pattern = kpmatch.compile("*.html")
+        self.assertTrue(pattern.match("index.html"))
+        self.assertTrue(pattern.match("about.html"))
+        self.assertFalse(pattern.match("about"))
+        self.assertFalse(pattern.match("about/about.html"))
+        self.assertFalse(pattern.match("content/deep/deeper/file.txt"))
+
+    def test_match_any_name_anywhere(self):
+        pattern = kpmatch.compile("**/*.html")
+        self.assertTrue(pattern.match("index.html"))
+        self.assertTrue(pattern.match("about.html"))
+        self.assertFalse(pattern.match("about"))
+        self.assertTrue(pattern.match("about/about.html"))
+        self.assertTrue(pattern.match("docs/getting-started/installation.html"))
+        self.assertFalse(pattern.match("content/deep/deeper/file.txt"))
+
+    def test_match_any_directory_name(self):
+        pattern = kpmatch.compile("packages/*/package.json")
+        self.assertFalse(pattern.match("packages/package.json"))
+        self.assertTrue(pattern.match("packages/a/package.json"))
+        self.assertTrue(pattern.match("packages/b/package.json"))
+        self.assertFalse(pattern.match("packages/a/b/package.json"))
+
+    def test_match_one_of(self):
+        pattern = kpmatch.compile("*.{png,jpg,jpeg,webp}")
+        self.assertTrue(pattern.match("image.png"))
+        self.assertTrue(pattern.match("image.jpg"))
+        self.assertTrue(pattern.match("image.jpeg"))
+        self.assertTrue(pattern.match("image.webp"))
+        self.assertFalse(pattern.match("image.svg"))
+
+    def test_match_character_set(self):
+        pattern = kpmatch.compile("*.[jt]s")
+        self.assertTrue(pattern.match("file.js"))
+        self.assertTrue(pattern.match("file.ts"))
+        self.assertFalse(pattern.match("file.rs"))
+        self.assertFalse(pattern.match("file.cs"))
+
+    def test_match_negative_character_set(self):
+        pattern = kpmatch.compile("*.[!jt]s")
+        self.assertFalse(pattern.match("file.js"))
+        self.assertFalse(pattern.match("file.ts"))
+        self.assertTrue(pattern.match("file.rs"))
+        self.assertTrue(pattern.match("file.cs"))
+
+    def test_match_any_character(self):
+        pattern = kpmatch.compile("*.?s")
+        self.assertTrue(pattern.match("file.js"))
+        self.assertTrue(pattern.match("file.ts"))
+        self.assertTrue(pattern.match("file.rs"))
+        self.assertTrue(pattern.match("file.cs"))
diff --git a/test/parse.py b/test/parse.py
new file mode 100644
index 0000000..064f9ba
--- /dev/null
+++ b/test/parse.py
@@ -0,0 +1,222 @@
+import os.path
+from unittest import TestCase
+
+from kpmatch import PatternParsingError
+import kpmatch.matchers as m
+import kpmatch.parse as p
+
+
+def join_matchers(first: m.PathMatcher, *others: m.PathMatcher) -> m.PathMatcher:
+    for matcher in others:
+        first.append(matcher)
+    return first
+
+
+class ParseTests(TestCase):
+    def test_parse_pattern(self):
+        # pattern <- (any_segments / fixed_segment)*
+        self.assertEqual(
+            p._parse_pattern("?a[bc]/**/*.{def,ghi}"),
+            join_matchers(
+                m.AnyCharacter(),
+                m.FixedName("a"),
+                m.CharacterSet("bc", False),
+                m.EndOfSegment(),
+                m.AnySegments(),
+                m.AnyName(),
+                m.FixedName("."),
+                m.OneOf((m.FixedName("def"), m.FixedName("ghi"))),
+                m.EndOfSegment(),
+                m.EndOfPath(),
+            ),
+        )
+
+    def test_parse_any_segments(self):
+        # any_segments <- "**" (SEP / EOS)
+        self.assertTupleEqual(p._parse_any_segments("**", 0), (m.AnySegments(), 2))
+        self.assertTupleEqual(p._parse_any_segments("**/a", 0), (m.AnySegments(), 3))
+        self.assertTupleEqual(p._parse_any_segments("**a", 0), (None, 0))
+
+    def test_parse_fixed_segment(self):
+        # fixed_segment <- name_part+ (SEP / EOS)
+        self.assertTupleEqual(
+            p._parse_fixed_segment("?a[bc]/*.{def,ghi}", 0),
+            (
+                join_matchers(
+                    m.AnyCharacter(),
+                    m.FixedName("a"),
+                    m.CharacterSet("bc", False),
+                    m.EndOfSegment(),
+                ),
+                7,
+            ),
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_segment("?a[bc]/*.{def,ghi}", 7),
+            (
+                join_matchers(
+                    m.AnyName(),
+                    m.FixedName("."),
+                    m.OneOf((m.FixedName("def"), m.FixedName("ghi"))),
+                    m.EndOfSegment(),
+                ),
+                18,
+            ),
+        )
+
+    def test_parse_name_part(self):
+        # name_part <- any_name / one_of / simple_name_part / ","
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 0), (m.AnyCharacter(), 1)
+        )
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 1), (m.FixedName("a"), 2)
+        )
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 2), (m.CharacterSet("bc", False), 6)
+        )
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 6), (m.FixedName(","), 7)
+        )
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 7), (m.AnyName(), 8)
+        )
+        self.assertTupleEqual(
+            p._parse_name_part("?a[bc],*{def,ghi}", 8),
+            (m.OneOf((m.FixedName("def"), m.FixedName("ghi"))), 17),
+        )
+
+    def test_parse_any_name(self):
+        # any_name = "*"+
+        self.assertTupleEqual(p._parse_any_name("*a", 0), (m.AnyName(), 1))
+        self.assertTupleEqual(p._parse_any_name("a*", 1), (m.AnyName(), 2))
+        self.assertTupleEqual(p._parse_any_name("a***a", 1), (m.AnyName(), 4))
+
+    def test_parse_one_of(self):
+        # one_of = "{" simple_name_part+ ("," simple_name_part+)* "}"
+        self.assertTupleEqual(p._parse_one_of("", 0), (None, 0))
+        self.assertTupleEqual(p._parse_one_of("abc,def}", 0), (None, 0))
+        self.assertTupleEqual(p._parse_one_of("{abc,def", 0), (None, 0))
+        self.assertTupleEqual(
+            p._parse_one_of("{abc,def}", 0),
+            (m.OneOf((m.FixedName("abc"), m.FixedName("def"))), 9),
+        )
+        self.assertTupleEqual(
+            p._parse_one_of("{a[bc],d?f,ghi}", 0),
+            (
+                m.OneOf(
+                    (
+                        join_matchers(m.FixedName("a"), m.CharacterSet("bc", False)),
+                        join_matchers(
+                            m.FixedName("d"), m.AnyCharacter(), m.FixedName("f")
+                        ),
+                        m.FixedName("ghi"),
+                    )
+                ),
+                15,
+            ),
+        )
+        self.assertRaises(PatternParsingError, p._parse_one_of, "{abc{def}", 0)
+        self.assertTupleEqual(
+            p._parse_one_of("{abc{def}", 4), (m.OneOf((m.FixedName("def"),)), 9)
+        )
+        self.assertTupleEqual(
+            p._parse_one_of("{abc}def}", 0), (m.OneOf((m.FixedName("abc"),)), 5)
+        )
+        self.assertTupleEqual(
+            p._parse_one_of(os.path.join("{abc", "def}"), 0),
+            (None, 0),
+        )
+        self.assertTupleEqual(p._parse_one_of("{,def", 0), (None, 0))
+        self.assertRaises(PatternParsingError, p._parse_one_of, "{,def}", 0)
+
+    def test_parse_one_of_choice(self):
+        # one_of_choice = simple_name_part+
+        self.assertTupleEqual(
+            p._parse_one_of_choice("?a[bc],def", 0),
+            (
+                join_matchers(
+                    m.AnyCharacter(), m.FixedName("a"), m.CharacterSet("bc", False)
+                ),
+                6,
+            ),
+        )
+
+    def test_parse_simple_name_part(self):
+        # simple_name_part = any_character / character_set / fixed_name
+        self.assertTupleEqual(
+            p._parse_simple_name_part("?a[bc]", 0), (m.AnyCharacter(), 1)
+        )
+        self.assertTupleEqual(
+            p._parse_simple_name_part("?a[bc]", 1), (m.FixedName("a"), 2)
+        )
+        self.assertTupleEqual(
+            p._parse_simple_name_part("?a[bc]", 2), (m.CharacterSet("bc", False), 6)
+        )
+
+    def test_parse_any_character(self):
+        self.assertTupleEqual(p._parse_any_character("?a", 0), (m.AnyCharacter(), 1))
+        self.assertTupleEqual(p._parse_any_character("a?", 1), (m.AnyCharacter(), 2))
+
+    def test_parse_character_set(self):
+        self.assertTupleEqual(p._parse_character_set("", 0), (None, 0))
+        self.assertTupleEqual(p._parse_character_set("abc]", 0), (None, 0))
+        self.assertTupleEqual(p._parse_character_set("[abc", 0), (None, 0))
+        self.assertTupleEqual(
+            p._parse_character_set("[abcdef]", 0), (m.CharacterSet("abcdef", False), 8)
+        )
+        self.assertTupleEqual(
+            p._parse_character_set("[!abcdef]", 0), (m.CharacterSet("abcdef", True), 9)
+        )
+        self.assertTupleEqual(p._parse_character_set("[abcdef]", 3), (None, 3))
+        self.assertRaises(PatternParsingError, p._parse_character_set, "[abc[def]", 0)
+        self.assertTupleEqual(
+            p._parse_character_set("[abc[def]", 4), (m.CharacterSet("def", False), 9)
+        )
+        self.assertRaises(PatternParsingError, p._parse_character_set, "[abc!def]", 0)
+        self.assertTupleEqual(
+            p._parse_character_set("[abc]def]", 0), (m.CharacterSet("abc", False), 5)
+        )
+        self.assertTupleEqual(
+            p._parse_character_set(os.path.join("[abc", "def]"), 0),
+            (None, 0),
+        )
+
+    def test_parse_fixed_name(self):
+        self.assertTupleEqual(p._parse_fixed_name("", 0), (None, 0))
+        self.assertTupleEqual(
+            p._parse_fixed_name("abcdef", 0), (m.FixedName("abcdef"), 6)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abcdef", 2), (m.FixedName("cdef"), 6)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc[def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc!def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc]def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc{def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc,def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc}def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc*def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name("abc?def", 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name(os.path.join("abc", "def"), 0), (m.FixedName("abc"), 3)
+        )
+        self.assertTupleEqual(
+            p._parse_fixed_name(os.path.join("abc", "def"), 2), (m.FixedName("c"), 3)
+        )
diff --git a/test/public_api.py b/test/public_api.py
new file mode 100644
index 0000000..9c8cafa
--- /dev/null
+++ b/test/public_api.py
@@ -0,0 +1,60 @@
+import fnmatch
+from configparser import ParsingError
+from typing import Callable, Any
+from unittest import TestCase
+
+import kpmatch
+from kpmatch import PatternParsingError
+
+
+class ParseTests(TestCase):
+    def test_compile(self):
+        pattern = kpmatch.compile("*.txt")
+        self.assertIsInstance(pattern, kpmatch.Pattern)
+        self.assertTrue(pattern.match("file.txt"))
+        self.assertEqual(pattern.specificity, 12)
+
+    def test_kpmatch(self):
+        self.assertTrue(kpmatch.kpmatch("file.txt", "*.txt"))
+        self.assertFalse(kpmatch.kpmatch("file.jpg", "*.txt"))
+
+    def test_is_valid_pattern(self):
+        self.assertTrue(kpmatch.is_valid_pattern("*.txt"))
+        self.assertFalse(kpmatch.is_valid_pattern("[.txt"))
+
+    def test_specificity(self):
+        self.assertEqual(kpmatch.specificity(""), 0)
+        self.assertEqual(kpmatch.specificity("**"), 1)
+        self.assertEqual(kpmatch.specificity("*.txt"), 12)
+        self.assertEqual(kpmatch.specificity("file.txt"), 15)
+
+    def assertRaisesPPE(self, error_message: str, position: int, pattern: str):
+        with self.assertRaises(PatternParsingError) as cm:
+            kpmatch.compile(pattern)
+        self.assertEqual(
+            str(PatternParsingError(error_message, pattern, position)),
+            str(cm.exception),
+        )
+
+    def test_error_messages(self):
+        self.assertRaisesPPE("Empty path segment", 4, "abc//def")
+
+        self.assertRaisesPPE('Missing closing bracket "]" to match "["', 3, "abc[def")
+        self.assertRaisesPPE(
+            'Character "!" is not allowed inside a character set', 6, "abc[de!f]"
+        )
+        self.assertRaisesPPE(
+            'Character "[" is not allowed inside a character set', 6, "abc[de[f]"
+        )
+
+        self.assertRaisesPPE('Missing closing bracket "}" to match "{"', 3, "abc{def")
+        self.assertRaisesPPE(
+            'Character "{" is not allowed inside a one-of pattern', 6, "abc{de{f}"
+        )
+        self.assertRaisesPPE(
+            'A star "*" wildcard is not allowed inside a one-of pattern',
+            8,
+            "abc{def,*}",
+        )
+        self.assertRaisesPPE("Empty choice in a one-of pattern", 8, "abc{def,}")
+        self.assertRaisesPPE("Empty choice in a one-of pattern", 4, "abc{,def}")
diff --git a/test/specificity.py b/test/specificity.py
new file mode 100644
index 0000000..5b615ad
--- /dev/null
+++ b/test/specificity.py
@@ -0,0 +1,21 @@
+from unittest import TestCase
+
+from kpmatch import specificity
+
+
+class SpecificityTests(TestCase):
+    def test_compare_specificity(self):
+        self.assertGreater(specificity("**"), specificity(""))
+        self.assertGreater(specificity("**/a"), specificity("**"))
+        self.assertGreater(specificity("**/a/file.txt"), specificity("**/a/*.txt"))
+        self.assertGreater(specificity("file.txt"), specificity("*.txt"))
+        self.assertGreater(specificity("*.txt"), specificity("*"))
+        self.assertGreater(specificity("file.{txt,html}"), specificity("*.txt"))
+        self.assertGreater(specificity("image_???.png"), specificity("image_*.png"))
+        self.assertGreater(specificity("image.png"), specificity("image_???.png"))
+
+        self.assertEqual(specificity("**/a"), specificity("**/b"))
+        self.assertEqual(specificity("*.txt"), specificity("*.html"))
+        self.assertEqual(
+            specificity("image_?.png"), specificity("image_[0123456789].png")
+        )