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<?php // Here is a url that contains some regex strings (see the (\d+) twice)? // I want to replace each one individually, using a regex of the regex, with the contents of the $params array // Final result should be http://whatever.com/en-GB/companies/8556/blah/502034/link/etc // Note they're in the correct order! $expectedUrl = "http://whatever.com/en-GB/companies/(\d+)/blah/(\d+)/link/etc"; preg_match_all('#$(.*?)$#', $expectedUrl, $matches); $search = $matches[0]; $params = array(8556, "?"); foreach (array_combine($params, $search) as $value => $key) { $split = str_split($key); foreach ($split as &$char) { if ($char !== "\\") $char = "\\" . $char; } $split = implode("", $split); $expectedUrl = preg_replace("/".$split."/", $value, $expectedUrl, 1); } var_dump($expectedUrl);