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import re
def translate(pattern):
r"""
Given a glob pattern, produce a regex that matches it.
>>> translate('*.txt')
'[^/]*\\.txt'
>>> translate('a?txt')
'a.txt'
>>> translate('**/*')
'.*/[^/]*'
"""
return ''.join(map(replace, separate(pattern)))
def separate(pattern):
"""
Separate out character sets to avoid translating their contents.
>>> [m.group(0) for m in separate('*.txt')]
['*.txt']
>>> [m.group(0) for m in separate('a[?]txt')]
['a', '[?]', 'txt']
"""
return re.finditer(r'([^\[]+)|(?P<set>[\[].*?[\]])|([\[][^\]]*$)', pattern)
def replace(match):
"""
Perform the replacements for a match from :func:`separate`.
"""
return match.group('set') or (
re.escape(match.group(0))
.replace('\\*\\*', r'.*')
.replace('\\*', r'[^/]*')
.replace('\\?', r'.')
)