# `fnmatch` --- Unix 檔案名稱模式比對

原始碼： Lib/fnmatch.py

This module provides support for Unix shell-style wildcards, which are not the same as regular expressions (which are documented in the `re` module). The special characters used in shell-style wildcards are:

Pattern | 含義
--- | ---
`*` | matches everything
`?` | matches any single character
`[seq]` | matches any character in seq
`[!seq]` | matches any character not in seq

For a literal match, wrap the meta-characters in brackets. For example, `'[?]'` matches the character `'?'`.

Note that the filename separator (`'/'` on Unix) is not special to this module. See module `glob` for pathname expansion (`glob` uses `filter()` to match pathname segments). Similarly, filenames starting with a period are not special for this module, and are matched by the `*` and `?` patterns.

Unless stated otherwise, "filename string" and "pattern string" either refer to `str` or `ISO-8859-1` encoded `bytes` objects. Note that the functions documented below do not allow to mix a `bytes` pattern with a `str` filename, and vice-versa.

Finally, note that `functools.lru_cache()` with a maxsize of 32768 is used to cache the (typed) compiled regex patterns in the following functions: `fnmatch()`, `fnmatchcase()`, `filter()`, `filterfalse()`.

fnmatch.fnmatch(name, pat)

  Test whether the filename string name matches the pattern string pat, returning `True` or `False`. Both parameters are case-normalized using `os.path.normcase()`. `fnmatchcase()` can be used to perform a case-sensitive comparison, regardless of whether that's standard for the operating system.

  This example will print all file names in the current directory with the extension `.txt`:

      import fnmatch
      import os

      for file in os.listdir('.'):
          if fnmatch.fnmatch(file, '*.txt'):
              print(file)

fnmatch.fnmatchcase(name, pat)

  Test whether the filename string name matches the pattern string pat, returning `True` or `False`; the comparison is case-sensitive and does not apply `os.path.normcase()`.

fnmatch.filter(names, pat)

  Construct a list from those elements of the iterable of filename strings names that match the pattern string pat. It is the same as `[n for n in names if fnmatch(n, pat)]`, but implemented more efficiently.

fnmatch.filterfalse(names, pat)

  Construct a list from those elements of the iterable of filename strings names that do not match the pattern string pat. It is the same as `[n for n in names if not fnmatch(n, pat)]`, but implemented more efficiently.

  在 3.14 版被加入.

fnmatch.translate(pat)

  Return the shell-style pattern pat converted to a regular expression for using with `re.prefixmatch()`. The pattern is expected to be a `str`.

  範例：

      >>> import fnmatch, re
      >>>
      >>> regex = fnmatch.translate('*.txt')
      >>> regex
      '(?s:.*\\.txt)\\z'
      >>> reobj = re.compile(regex)
      >>> reobj.prefixmatch('foobar.txt')
      <re.Match object; span=(0, 10), match='foobar.txt'>

也參考

`glob` 模組

  Unix shell-style path expansion.