RegexpFactory.php
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	<?php

	/**
	* Performs operation from given a regular expression
	*/
	class RegexpFactory {
	/**
	* The regular expression
	* @var string
	*/
	public $expression;

	/**
	* The last error
	* @var string
	*/
	public $lastError;

	/**
	* Initializes a new instance of the RegexpFactory object.
	*
	* @param string The regular expression
	*/
	function __construct ($expression) {
	$this->expression = $expression;
	}

	/**
	* Replaces an expression using regexp, a similar way Apache mod_rewrite and Nginx wreplace do.
	*
	* @param string $haystack The expression to perform a replacement on
	* @param string $replaceExpression The format of the result string
	* @return string The replaced string
	*/
	function replace ($haystack, $replaceExpression) {
	return preg_replace($this->expression, $replaceExpression, $haystack);
	}

	/**
	* Encloses the regular expression with delimiters.
	*/
	function addDelimiters () {
	$delimiters = ['/', '@', '#', '~', '+', '%', '♦', 'µ', '±', '☞'];
	//TODO: check if it's okay to use UTF-8 characters as delimiters
	foreach ($delimiters as $delimiter) {
	if (strpos($this->expression, $delimiter) === false) {
	$this->expression = $delimiter . $this->expression . $delimiter;
	return;
	}
	}
	throw new Exception("Can't delimite regexp $this->expression");
	}

	/**
	* Determines if the specified expression is valid.
	*
	* @return bool true if the expression is valid; otherwise, false.
	*/
	public function isValid () {
	$this->lastError = '';
	set_error_handler('self::handleErrors');
	$result = preg_match($this->expression, null);
	restore_error_handler();
	if ($this->lastError === '' && $result === false) {
	$this->lastError = self::getPCREError();
	}
	return $result !== false;
	}

	/**
	* Callback for error handler
	*
	* @param int $errno he level of the error raised
	* @param string $errstr the error message
	* @return bool if false, the normal error handler continues
	*/
	private function handleErrors ($errno, $errstr) {
	if ($errno == 2 && substr($errstr, 0, 14) == 'preg_match(): ') {
	$this->lastError = substr($errstr, 14);
	if (substr($this->lastError, 0, 20) == 'Compilation failed: ') {
	$this->lastError = ucfirst(substr($this->lastError, 20));
	}
	return true;
	}
	message_die(
	GENERAL_ERROR,
	$errstr . "<p>Please report this bug. This error should be handled by the regexp factory.</p>",
	'Regexp factory error'
	);
	}

	/**
	* Gets a string with an English error message matching the last PCRE error.
	*
	* @return The error message of the last PCRE library error.
	*/
	public static function getPCREError() {
	$errors = array(
	PREG_NO_ERROR => 'No error',
	PREG_INTERNAL_ERROR => 'There was an internal PCRE error',
	PREG_BACKTRACK_LIMIT_ERROR => 'Backtrack limit was exhausted',
	PREG_RECURSION_LIMIT_ERROR => 'Recursion limit was exhausted',
	PREG_BAD_UTF8_ERROR => 'The offset didn\'t correspond to the begin of a valid UTF-8 code point',
	PREG_BAD_UTF8_OFFSET_ERROR => 'Malformed UTF-8 data',
	);

	return $errors[preg_last_error()];
	}
	}

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