Advanced Python Regex: Groups, Lookarounds and Substitution (Part 2)
Advanced Python regex with tested output: named groups, lookarounds, re.sub with a function, and why a 24-character input made (a+)+$ run for 10 seconds.
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Regular Expressions in Python, Part 1: Syntax, Functions, Flags
Regular expressions in Python from the ground up: raw strings, core syntax, match vs search vs fullmatch, flags, and five mistakes that silently break patterns.