re.sub 如何一步完成? [英] re.sub how to do it in one step?

问题描述

我尝试将这些步骤合二为一，但它不起作用

I try to put this steps in one, but it doesnt work

w = re.sub('[0-9]', r'9', w)
w = re.sub('[A-Z]', r'X', w)
w = re.sub('[a-z]', r'x', w)

有谁知道如何从XXxxxx999 --> Xx9.

Does anybody knows how to make from such strings as XXxxxx999 --> Xx9.

推荐答案

您可以使用回调方法作为替换参数，如下所示:

You may use a callback method as a replacement argument like this:

import re

rx = r'([0-9]+)|([A-Z]+)|[a-z]+'
w = "XXxxxx999"

def repl(m):
    if m.group(1):       # if ([0-9]) matched
        return '9'       # replace with 9
    elif m.group(2):     # if ([A-Z]) matched
        return 'X'       # replace with X
    else:                # if ([a-z]) matched
        return 'x'       # replace with x

print(re.sub(rx, repl, w)) # => Xx9

请参阅 Python 演示.

正则表达式匹配:

• ([0-9]+) - 第 1 组:1+ 位数
• | - 或
• ([A-Z]+) - 第 2 组:1+ 个大写字母
• | - 或
• [a-z]+ - 1+ 个小写字母.

• ([0-9]+) - Group 1: 1+ digits
• | - or
• ([A-Z]+) - Group 2: 1+ uppercase letters
• | - or
• [a-z]+ - 1+ lowercase letters.

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