向后移植Python 3.4的正则表达式"fullmatch()".到Python 2 [英] Backport Python 3.4's regular expression "fullmatch()" to Python 2

问题描述

Python 3.4引入了新的正则表达式方法 re.fullmatch(pattern, string, flags=0)

Python 3.4 introduced the new regex method re.fullmatch(pattern, string, flags=0).

有人将这个新方法移植到较旧的Python版本吗?

Has anyone back-ported this new method to older Python versions?

推荐答案

要确保整个字符串匹配，您需要使用\Z

To make sure that the entire string matches, you need to use the \Z end-of-string anchor:

def fullmatch(regex, string, flags=0):
    """Emulate python-3.4 re.fullmatch()."""
    return re.match("(?:" + regex + r")\Z", string, flags=flags)

\A锚点不是必需的，因为re.match()已经将匹配项锚定到字符串的开头.

The \A anchor is not necessary since re.match() already anchors the match to the start of the string.

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