Tools for writing and debugging RegEx

·         RegExr (for JavaScript)

·         Perl: YAPE: Regex Explain

·         Regex Coach (engine backed by CL-PPCRE)

·         RegexPal (for JavaScript)

·         Regular Expressions Online Tester

·         Regex Buddy

·         Regex 101 (for PCRE, JavaScript, Python, Golang)

·         Visual RegExp

·         Expresso (for .NET)

·         Rubular (for Ruby)

·         Regular Expression Library (Predefined Regexes for common scenarios)

·         Txt2RE

·         Regex Tester (for JavaScript)

·         Regex Storm (for .NET)

Books

·         Mastering Regular Expressions, the 2nd Edition, and the 3rd edition.

·         Regular Expressions Cheat Sheet

·         Regex Cookbook

·         Teach Yourself Regular Expressions

Free resources

·         Regular Expressions - Everything you should know (PDF Series)

·         Regex Syntax Summary

·         How Regexes Work