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Mastering Regular Expressions in PHP

What are Regular Expressions?

A regular expression is a pattern that can match various text strings. Using regular expressions you can find (and replace) certain text patterns, for example "all the words that begin with the letter A" or "find only telephone numbers". Regular expressions are often used in validation classes, because they are a really powerful tool to verify e-mail addresses, telephone numbers, street addresses, zip codes, and more.

In this tutorial I will show you how regular expressions work in PHP, and give you a short introduction on writing your own regular expressions. I will also give you several example regular expressions that are often used.

Regular Expressions in PHP

Using regex (regular expressions) is really easy in PHP, and there are several functions that exist to do regex finding and replacing. Let's start with a simple regex find.

Have a look at the documentation of the preg_match function (http://php.net/preg_match). As you can see from the documentation, preg_match is used to perform a regular expression. In this case no replacing is done, only a simple find. Copy the code below to give it a try.

Author Info:

Dennis Pallett is a young tech writer, with much experience in ASP, PHP and other web technologies. He enjoys writing, and has written several articles and tutorials. To find more of his work, look at his websites at http://www.phpit.net, http://www.aspit.net and http://www.webdev-articles.com dennis@nocertainty.com