Archív pre tag ‘regular expressions‘

The main purpose of regular expressions, also called regex or regexp, is to efficiently search for patterns in a given text. These search patterns are written using a special format which a regular expression parser understands.

Regular expressions are originating from Unix systems, where a program was designed, called grep, to help users work with strings and manipulate text. By following a few basic rules, one can create very complex search patterns.

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Regular expressions are a very useful tool for developers. They allow to find, identify or replace text, words or any kind of characters. In this article, I have compiled 15+ extremely useful regular expressions that any web developer should have in his toolkit.

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In this tutorial we will create a PHP URL router. The developer using the router will be able to define these routes with regular expressions, these will then map to a file, class and method which will be called – very similar to Django’s routing. By using regular expressions to define our URLs we get maximum customizability. /class/method/ based URL routing is too restrictive sometimes. We will assume the user is using an apache or similar web server with mod_rewite enabled. You can adapt this router and use it in your web application or framework.

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