Regular Expression Library Welcome to RegExLib.com, the Internet's first Regular Expression Library. Currently we have indexed 1756 expressions from 1165 contributors around the world. We hope you'll find this site useful and come back whenever you're looking for an expression for a particular task, or have just figured out a new expression that does something useful. Thanks!
	Regular Expressions Home Page Regular expressions allow programmers to compare a string to a template, and see if the string fits the template. The template, known as a regular expression, can contain a number of elements which define the pattern to be matched.
	REGex TESTER This site allows you to do a regex test, i.e. it utilizes JavaScript (AJAX) to instantly validate regular expressions (regex), by searching and replacing strings in a text based on the regular expression. The result is live, it is updated instantly while you type, without any submission of forms and extra clicking, thus allowing fast and easy edit of regular expressions, having a constant clue what they exactly do.
	The Premier website about Regular Expressions A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*\.txt$.