Regular expressions are commonly used in pattern matches and replacements processes. Many text editors, programming languages, and software testing tools offers pattern match and replacement functions. This page allows you to learn and test regular expression used in match and replacement processes.
What is a regular expression?
A regular expression is a string of normal and meta characters that can be evaluated as a match pattern. The best reference guide on regular expression is the Perl manual called "perlre". You can easily find and download a copy of "perlre" on the Web.
For example, "/^(http:\/\/)?[^\/]+/i" is a regular expression that represents a pattern to match the base URL of any Web page URL.
How to use regular expressions in a search and replace function?
To help you learn and test regular expression match patterns, FYIcenter.com has designed this online testing page using the PHP preg_replace() funtion:
All you need to do is to enter the pattern string and the subject string in the form below and click the Start button. Remember that the pattern string must include "/" as delimiters.
Other On-line Testing Pages by FYIcenter.com
FYIcenter.com has prepared some simple but very interesting on-line testing pages that are useful for your programming and testing tasks:
Each tutorial answers one commonly asked PHP programming question with a short, but precise and clear PHP script.