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How are regex used in the real world?

developing_Dev
・1 min read

Hey ya'll JavaScript ninjas!

I am currently going through the regex module on FCC and I am just wondering how Regular Expressions are used in the real world and how often is it used?

Discussion (8)

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tux0r profile image
tux0r

Anytime anyone wants to match a pattern, basically.

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crisacosta9 profile image
developing_Dev Author

like passwords and usernames?

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tux0r profile image
tux0r

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.

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crisacosta9 profile image
developing_Dev Author

Awesome! Thank you senpai!

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link2twenty profile image
Andrew Bone

You can use regex on passwords for complexity checking.

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tux0r profile image
tux0r

Indirectly. Regex won't help you with entropy checking.

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crisacosta9 profile image
developing_Dev Author

what's "entropy checking" in English again?

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tux0r profile image
tux0r • Edited

Checking a password's entropy.

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