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The Joy of Regular Expressions, Part 2: Character Classes | by Matt Cummings | Better Programming
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Beginner's Guide to Regular Expressions in Python | by Raymond Cheng | Towards Data Science
Easily digestible introduction to Regex in JavaScript – clubmate.fi
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Demystifying Regular Expressions in R - Rsquared Academy Blog - Explore Discover Learn
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Regular Expressions: Regexes in Python (Part 1) – Real Python
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Getting started with regex - Zero Day Hacker
Java Regex Cheat Sheet | JRebel by Perforce
Demystifying Regular Expressions in R | R-bloggers
2.3: Regular Expressions: Character Classes - Programming with Text - YouTube
Regular Expression
character-class in r
Detailed Guide to Regular Expressions | vizartpandey regex
regex - Re2 unicode character class - Stack Overflow
