Matches any IPv4 address

matching words between square brachets tags include newline or carriage return

Matches HTML structure

Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found

This will remove all facebook urls from a HTML string

Match regular expressions substitutions, I personally use this to perform my validate if it is a substitution, then call re.sub() on it.

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

This regex is to match Ascending or descending order of 8 digit number

The regex to match a single pro forma modification with all its intricacies.

For string splitting / deconstructing

An extremely complete regex, that... Accepts international phones and most of regional phone numbers; Accepts phone numbers with/without "+", with/without space or "-" in the middle of the phone, and more. Gets groups of all important data of the phone number (local code, country code and the phone number itself)

Full email validation with optional "." "-" "_"

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

Awesome explanation of nested lookbacks

Validates Multiple email addresses seperated by comma.

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

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

/* -- This is a RegEx for validating one Italian ATECO code. -- For original specification visit: http://www.istat.it/it/archivio/17888 -- Valid: */ 1 01 01.2 01.02 01.02.3 01.02.03 // Not Valid: a asc 0123 012.3 013.456 123456 01/02/03

find mp3 file embeded in a link

checklists item

allows for all legal IPv4 addresses

Validates input to match UK Date Time standard

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.

Regular expression for a validating a string with following rules: at least one lowercase letter at least one upper case letter at least one digit length between 6 and 14 ^(?=.\d)(?=.[a-z])(?=.*[A-Z]).{6,14}$

Detect various possible HTML linebreak tags (eg. )