This is a relaxed cron validation, meaning that any valid cron expression should pass this; but not anything that passes regex validation is a good cron expression. Used as preliminary validation in web ui. Supports all special characters. Includes seconds field.

Validates input to match UK Date Time standard

find mp3 file embeded in a link

Regex to constrain a text to have at least 2 strings. Compatible with 2nd-3rd-Nth names/surnames.

matches only those commas that are between sets, or between members of a set. does not match commas that are inside members.

Validating comma delimited strings for whitespaces & extra commas -- +(,()+){0,}

This will remove all facebook urls from a HTML string

matching words between square brachets tags include newline or carriage return

Matches any IPv4 address