pregsprintf.php
13a200ca7621stable

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;
			}