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Regular Expressions: You are the master of your (massive) text

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There are a few apps that provide cheat sheets and expression exercises. Here are a couple of them.

https://play.google.com/store/apps/details?id=com.andkorsh.regexpal&hl=en_US 

https://regexr.com/

https://play.google.com/store/apps/details?id=spencerstudios.com.regexapp&hl=en_US

 

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