如何清除字符串开头或结尾的非字母数字字符 [英] How to get rid of non-alphanumeric characters at the beginning or end of a string

问题描述

我有一个列表，其元素在每个字符串的开头或结尾有不必要的（非字母数字）字符。

I have a list with elements that have unnecessary (non-alphanumeric) characters at the beginning or end of each string.

例如

'cats--'

我想摆脱 -

我试过：

for i in thelist:
    newlist.append(i.strip('\W'))

b $ b

这没有用。任何建议。

That didn't work. Any suggestions.

推荐答案

def strip_nonalnum(word):
    for start, c in enumerate(word):
        if c.isalnum():
           break
    for end, c in enumerate(word[::-1]):
        if c.isalnum():
           break
    return word[start:len(word) - end]

print([strip_nonalnum(s) for s in thelist])

或

import re

def strip_nonalnum_re(word):
    return re.sub(r"^\W+|\W+$", "", word)

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