如何在python中使用正则表达式用正则表达式模式替换子字符串？

Question

I have a string "word ***.** word" . And I want to replace the '***.**' with '[\\d][\\d][\\d].[\\d]+' . Unable to do it using regex as it's giving key error for '\\d' . My code is:

text = 'word ***.** word'
updated_text = re.sub(re.compile(r'\b\*\*\*\b', re.I), '[\d][\d][\d]', text)

I'm getting this error:

Traceback (most recent call last):
  File "/usr/lib/python3.8/sre_parse.py", line 1039, in parse_template
this = chr(ESCAPES[this][1])
KeyError: '\\d'

I know that my code is not correct. But I can't think of any different way. Didn't find anything in the community blogs, as well.

Answer 1

This should do the trick:

import re

text = 'word ***.** word'
updated_text = re.sub(re.compile(r'\*', re.I), r'[\\d]', text)
print(updated_text)