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

问题描述

我有一个列表，其中的元素在每个字符串的开头或结尾都有不必要的(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-

我尝试过:

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

那没有用.有任何建议.

That didn't work. Any suggestions.

推荐答案

def strip_nonalnum(word):
    if not word:
        return word  # nothing to strip
    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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