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Hanaasagi/re_flatten.py

Last active March 19, 2017 03:47
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将正则表达式中的捕获组转换为非捕获组
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re_flatten.py
# borrow from bottle.py
def _re_flatten(p):
''' Turn all capturing groups in a regular expression pattern into
non-capturing groups. '''
if '(' not in p: return p
return re.sub(r'(\\*)(\(\?P<[^>]+>|\((?!\?))',
lambda m: m.group(0) if len(m.group(1)) % 2 else m.group(1) + '(?:', p)
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