a mac address separated by dashes or colons.

Given a number N represented by its unary form N(1), when RegEx doesn't match N(1), N is prime

This regular expression is designed to work with character-delimited strings, and provides a means to specify the index of delimiter occurrence at which content is extracted.

List of EmailAddresses optionally allowing with personal i.e. "Personal Name "

extracts face/slice/axis rotations, pieces, patterns and groups

YourLink - not found AnotherLink - found

masked phone input validator

Exist a problem with simple regex in JS Solution from: https://www.safaribooksonline.com/library/view/regular-expressions-cookbook/9781449327453/ch09s10.html

test

Validates 00:00:00 to 23:59:59

check if the format is HH:MM (00:00 is OK, 0:00 is not)