Validates upper and lower case, allows all : or all -. Obtained here: http://stackoverflow.com/questions/4260467/what-is-a-regular-expression-for-a-mac-address ...

Policy: At least five digits. No whitspaces. Two out of four groups - digits, lowercase, uppercase, special charterers

Extract the Channel Username or Channel ID given a YouTube Channel URL.

This regex is for validating Roumanian CNP ^[1-9]\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])(0[1-9]|[1-4]\d|5[0-2]|99)(00[1-9]|0[1-9]\d|[1-9]\d\d)\d$

Forked from https://regex101.com/r/vL1pD2/1