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Regex

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Reference:docs.python.org

Match ​

Use match or fullmatch to check for matches. It returns the match if succeeds, None on fail.

py
is_match = re.fullmatch('[0-9]{4}-[0-9]{2}', text) is not None
is_match = re.match('^[0-9]{4}-[0-9]{2}$', text) is not None

Extract text from a string:

py
import re

iter_obj = re.finditer(r'<img.*?[^>]>', text)
match_obj = re.search(r'upload_id=(\d+)', html_tag)

match_obj.group(0)  # The whole match
match_obj.group(1)  # Capturing group 1

Replace ​

py
import re

re.sub(r'regex', repl, text, count=0)