Regular expression for the PHP developers, on of the most popular tool for validating data is the regular expression. In this list we provides some validation - string match, password match validation, email address validation, date format and many more which helps developer to make their application more fast and easy to execute. [...] Have you note that, regular expressions are more slower than the basic string function, its takes a short time to execute than any others.

Included in their list are things like:

• Password Match Validation
• Validate URL
• Validate URL using Preg_match
• UK Postcode Validation
• SSN,ISBN and Zipcode Validation

A few of these could be done with either one or two string calls or some of the filtering functions that are included in PHP.