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Anytime anyone wants to match a pattern, basically.

 
 

Technically, yes. Practically, that does not make much sense. Why would anyone limit the pattern for usernames or passwords?

Better examples: Zip codes, phone numbers, HTML tags. I use regex to cross-post HTML-formatted articles with BBCode into web forums. E-mail addresses won't work though.

Classic DEV Post from Jun 24

What If I Want My Website to Last for 100 Years?

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