【python】正则替换

正则替换可以使用函数

例如：替换字符串中所有#1.2.3.4#格式中的数字为0

import re

def replace(x):
    def _replace(matched):
        m = matched.group()
        change = re.sub("\d", '0', m)
        return change

    pattern = "#((\d*\.)+\d+)#"
    r = re.sub(pattern, _replace, x)
    return r

x = "ab.c.d.#1.0.3.4# 2.2.2asdf"
r = replace(x)

print x
print r

输出：

ab.c.d.#1.0.3.4# 2.2.2asdf
ab.c.d.#0.0.0.0# 2.2.2asdf