Besides leap year handling, this takes care of date validation in the yy-mm-dd format.

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

Extracts values of the form £nnn,nnn.nn or $nnn.nnn from text

Matches ISO 8601 date formats

This regex should extract the subdomain, if any, or the domain, if no subdomain is used, from an arbitrary URL

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

Find " and ' quoted strings and "orphaned"/single words in a string

used to parse timezone in the format -08:00 or +05:30

search any word with an accent

email that accepts the plus (+) symbol

Grabs all HTML tags

Verifies Number is a negative/positive number. Number may be a decimal, but if it is, it requires at least one number before and after the decimal place. Decimal numbers may also be negative or positive. Only 1 decimal place is allowed.

CheckEmail Login start or end simbols [._- ] .login@domain.com - fail -login@domain.com - fail _login@domain.com - fail login.@domain.com - fail...

For scraping http://skepticsannotatedbible.com/

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