Sweet Regex thing…

Most of you probably will have no idea what this is…but it its my first example of using regular expressions to do string parsing and feeding that back as a function call..its well documented – check it after the break

<?php
/*
Takes a string ($text) and replaces all regex matches with the return from a function call of the same name.
Usage:  run_replace_callback($regex, $text);
You can overload the defaults set below in the function call
	overloaded example: run_replace_callback('/:([a-zA-Z_]+)/', 'this is the text :functiontodo');
*/

//the regular expression used for parsing
$regex = '/:([a-zA-Z_]+)/';
//the preface tag to add to the string before calling the function
$func_preface = 'userfunction_';
//the string to be parsed
$text = "This is some text and do the following function :dofunction and more text";

//the functions that render the replacement text - note that all function names must start with the value of $func_preface
//Place all functions below -- if you have a lot, probably will want to put these in another included php file
function userfunction_dofunction() {
  return 'FUNCTION RESULT';
}
//END FUNCTIONS

//the function that takes the matched text, adds the preface, and runs the function if it exists.  Otherwise returns the full match
function run_user_function($matches) {
	global $func_preface;
	// as usual: $matches[0] is the complete match
	// $matches[1] the match for the first subpattern
	$function = $func_preface.$matches[1];
	if(function_exists($function)) {
		return call_user_func($function);
	}
}

//the function that accepts the regex to use and the text to use and runs the preg_replace_callback function
function run_replace_callback($regex_to_use, $text_to_use) {
	echo preg_replace_callback(
			$regex_to_use,
            'run_user_function',
            $text_to_use);
}
?>

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