如何使用 python 中的正则表达式删除除某些特殊字符外的所有特殊字符

Question

I have this string: ".#€f#$#" I want to use regex to remove all special characters at the beginning and the end and stop when i encounter the first character that's excluded,lets say the characters ["$", "€"] are excluded. the result should be "€f#$", Also. i have different lists of characters that are excluded from the beginning and different at the end.

text = "!#€f#$#"
newtext = re.sub("\W*$", "", text)

This only affects the ending characters and it removes ALL specials without exceptions

Answer 1

You may use

import re
text = "!#€f#$#"
newtext = re.sub(r"^[^\w$€]+|[^\w$€]+$", "", text)
print(newtext)

See the Python demo

Details

• ^[^\w$€]+ - start of string ( ^ ) and 1 or more chars other than word chars, $ and € ( [^\w$€]+`)
• | - or
• [^\w$€]+$ - 1 or more chars other than word chars, $ and € and end of string ( $`).