Password requirements (minimum length, character groups that must exist) can be easily validated AND extended using look-aheads.

The regex verifies floating point numbers in decimal or scientific notation with extensive error checking - however, there may be edge cases which i haven't addressed, so feel free to put in more unit tests!

The specification for this regex is based upon the extracts from RFC 1034 and RFC 2181 below. It is also assumed that you are trying to extract the FQDN from a pipe-delimited string. If this is not the case then you will need to adjust the regex as necessary by either removing the pipe character o...

The aim of this regex is to extract only the Nth field from a delimited string. In the example provided the delimited is the pipe character. You will have to substitute the pipe character for whatever delimiter you are using.

The PHP function var_dump() provides debugging output, but has more line-breaks than is needed for readability. This regex strips out the (in my eyes) unnecessary line-breaks. Good in a self written debugging method in combination with ob_start()and ob_get_contents().

This slug regex is optimized using strictly my own opinions. Slugs: Should be english, alphanumeric phrases separated with a single dash. Should not contain single alpha character between dashes. ...

This one allows to begin with a digit, however, sometimes e-mail should begin with an *English letter *

Work in progress

Telegram bot deep linking Telegram bots have a deep linking mechanism, that allows for passing additional parameters to the bot on startup. It could be a command that launches the bot — or an auth token to connect the user's Telegram account to their account on some external service. ...

Useful for phone number extraction

Used by CORS to check for localhost/private IP origins Check out the unit tests at /r/2Ofume/1/tests

Retorna um cpf no formato 123.456.789-11. Cpf de entrada deve conter apenas números

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.

Four examples of word wrapping at the 80 character mark, each one taking fewer steps than the last. Comment and uncomment lines with # to see the difference between versions. Optimization discussions welcome!

Saudi Postal Code has five digits, if you would to have more information check the below: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ First Digit (Postal Regions): "The postal region number is represented by the first digit of the postal code" ...

Inspired by Micheal Musson entry Wich was hard to use in regex flavours that don't support recursion (C# engine doesn't) i've build my own simpler version wich matches what i would accept as validation entry

Check validity of ethereum address