pregsprintf.php
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	<?php

	/**
	* Format a regular expression. Supports the following conversions:
	*
	* %s String
	* Escapes a string using `preg_quote`.
	*
	* %R Raw
	* Inserts a raw regular expression.
	*
	* @param string sprintf()-style format string.
	* @param string Flags to use with the regular expression.
	* @param ... Zero or more arguments.
	* @return string Formatted string.
	*/
	function pregsprintf($pattern /* , ... */) {
	$args = func_get_args();
	$flags = head(array_splice($args, 1, 1));

	$delim = chr(7);
	$userdata = array('delimiter' => $delim);

	$pattern = xsprintf('xsprintf_regex', $userdata, $args);
	return $delim.$pattern.$delim.$flags;
	}

	/**
	* @{function:xsprintf} callback for regular expressions.
	*/
	function xsprintf_regex($userdata, &$pattern, &$pos, &$value, &$length) {
	$delim = idx($userdata, 'delimiter');
	$type = $pattern[$pos];

	switch ($type) {
	case 's':
	$value = preg_quote($value, $delim);
	break;
	case 'R':
	$type = 's';
	break;
	}

	$pattern[$pos] = $type;
	}