Hello world! for Regex

• Commonly used regex for data preprocessing

Commonly used regex for data preprocessing

Adding a space before a punctuation if it is not already spaced.

import re

ex_str = 'This house is very old.'
ex_str = re.sub(r"([?.!,])", r" \1 ", ex_str)
ex_str = re.sub(r'[" "]+', " ", ex_str)
ex_str = re.sub("[^a-zA-Z?.!]+". " ", w)
ex_str = ex_str.strip()
print(ex_str)

1. Identifiers
   1. *
   2. .
   3. +
   4. ?
   5. []
   6. \1
   7. .*
   8. .+
   9. .? 10.