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Ruby strings Cheat Sheet by surendraa - Download free from Cheatography - Cheatography.com: Cheat Sheets For Every Occasion
Introduction to Pattern Matching in Ruby | Toptal
Using Regular Expressions to Pack-a-Punch Ruby String Manipulation | by Romy Maghsoudi | Medium
Introduction to regular expressions in Ruby - YouTube
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ruby - Why am I not able to match multiple lines with this regex on rubular? - Stack Overflow
