字符串简单替换

Question

我将大多数用户使用的简单正则表达式格式转换为正确的re python正则表达式字符串的最简单方法是什么？

作为一个例子,我需要转换这个:

string = "*abc+de?"

对此:

string = ".*abc.+de.?"

当然,我可以遍历字符串并按字符构建另一个字符串,但这肯定是一种低效的方法吗？

Answer 1

那些看起来不像你试图翻译的正则表达式,它们看起来更像unix shell globs.Python有一个模块用于执行此操作.它不知道你使用的"+"语法,但我的shell也不知道,我认为语法是非标准的.

>>> import fnmatch
>>> fnmatch.fnmatch("fooabcdef", "*abcde?")
True
>>> help(fnmatch.fnmatch)
Help on function fnmatch in module fnmatch:

fnmatch(name, pat)
    Test whether FILENAME matches PATTERN.

    Patterns are Unix shell style:

    *       matches everything
    ?       matches any single character
    [seq]   matches any character in seq
    [!seq]  matches any char not in seq

    An initial period in FILENAME is not special.
    Both FILENAME and PATTERN are first case-normalized
    if the operating system requires it.
    If you don't want this, use fnmatchcase(FILENAME, PATTERN).

>>>