1
The Greatest Regex Trick Ever (2014)
Describes a regular expressions technique to match a word or pattern except in certain contexts: excluding tags, ignoring contents, word blacklist.
Rex Egg
Regular Expressions Tutorial. Comprehensive resource covering basic to advanced uses of regex. Includes regex cheat sheet, tools, books and tricks.
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Visit rexegg.com → On Hacker News Mar 2018 – Jul 2021
2
Regular Expressions – Mastering Lookahead and Lookbehind
Regex Lookahead and Lookbehind Tutorial. Explains the fine details of Lookahead and Lookbehind, including zero-width matches, overlapping matches and atomicity.