matching words between square brachets tags include newline or carriage return

Matches HTML structure

This will remove all facebook urls from a HTML string

Gets all numbers in a string. This includes positive and negative numbers aswell as integers and floats. By: http://www.benlorantfy.com/

By inserting this regex in a programming language to test it against Codeforces 1800A you'll solve the task

For string splitting / deconstructing

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

Validates Multiple email addresses seperated by comma.

This regex matches roman numbers from 1 (I) to 3999 (MMMCMXCIX)

Use this Regex for server-side validation also with some slight modifications like so for .NET -- @\w+(-+.']\w+)@\w+([-.]\w+)\.[a-zA-Z0-9]{2,6}([-.{2,6})*;

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

SQL injection regEx pattern

find mp3 file embeded in a link