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This RE validates standard Bible verse notation.

Matches a md5 hash, simple yet powerful

Check italian fiscal code (codice fiscale) with "OMOCODIA" control

Matches 5 numeric digits, such as a zip code.

Use this along with this replacement string <img\1 /> to convert image tags to XHTML compliant image tags.

A simple expression to brazilian phone number code, with international code. Simple DDI without "+" 99 plus simple DDD (99) plus simple local phone number 3 or 4 digits plus "-" plus 4 digits.

Matches the registered trademark (®). Pretty simple, yet I dont think existed on RegExLib before.

Most Concise RegExp for matching Decimal IPs. If nothing else, it'll make your code easier to read. (And I know that \d?\d is \d{1,2} but that's 2 extra characters.) --Update: darkone noticed 8 characters could be shaved down. I've edited it to reflect this. Thanks, darkone!

Major credit card validator. Only checks that the format is 16 digits (optionally separated by hyphens), not the value of any of the digits.

Match the full names of the four main characters of The Flintstones.

Password matching expression. Password must be at least 4 characters, no more than 8 characters, and must include at least one upper case letter, one lower case letter, and one numeric digit.

This ist the Expression for a happy smiley. It should find all the usual writings of the emotion icon :)

Expression validating a octal string of any length.

Is used to evaluating domain names, none of the extras such as paths or protocols.

regex to validate unix device names (linux). useful for scripts using ifconfig or stuff

easy when you want to allow your users to post images, but in a controlled way. I used it like this (in php): $text = preg_replace("/(\[IMG\])(\S+?)(\[\/IMG\])/is", "<a href=\"\\2\" target=\"_blank\"><IMG SRC=\"\\2\" align=\"center\" height=\"100\" border=\"0\"></a>",$text); so whenever they use [img]http://www.foo.com/bleh.jpg[/img] it will be converted to <a href="http://www.foo.com/bleh.jpg" target="_blank"><IMG SRC="http://www.foo.com/bleh.jpg" align="center" height="100" border="0"></a> so you get a 100 pixels high picture, and when they click on it it opens in a new window... (to prevent users from posting huge pictures and stuff)

It validates Indian Vehicle Registration Number

UK Phone Number Allows leading and trailing spaces and optional spaces after the dialing code. Initially the expression I posted was \s*0\d{4}\s*\d{6}\s*|\s*0\d{3}\s*\d{7}\s* But this didn't include optional brackets e.g. (01603) 123123 or phone numbers in a London format e.g. 0208 123 1234

Can be used to remove <SCRIPT language="JavaScript"> <!-- //--> </SCRIPT> from embeded javascript Should be used as case insensitive

Matches the British Pound symbol. Pretty simple, yet I dont think existed on RegExLib before.