This regex matches only when all the following are true: password must contain 1 number (0-9) password must contain 1 uppercase letters password must contain 1 lowercase letters password must contain 1 non-alpha numeric number...

From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.

This regex prevents the writing of non-standard conventional commits. I'm available on my github

RegEx email /^((?!\.)[\w-_.]*)(@\w+)(\.\w+(\.\w+)?)$/gim; Just playing with Reg Ex. This to validate emails in following ways ...

Pattern matching and extracting color code formats using RegEx. https://github.com/Kyza/color-regex/

extract video id, index, play list id from youtube url

Matches all valid IP addresses from 0.0.0.0 to 255.255.255.255

Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.