Online PHP editor | refs for aFAh3

<?php function sed(string $re, string $sub): string { if (mb_strlen($re, "8bit") < 4 || $re[0] !== "s") throw new Error("Your syntax is invalid, go drown yourself"); [1 => $re, 2 => $rep, 3 => $mod] = preg_split("|(?<!\\\\){$re[1]}|", $re); $re = str_replace('@', '\@', $re); return preg_replace("@$re@$mod", $rep, $sub); } echo sed('s/@FOO\/BAR@/waa/i', 'wee/@foo/bar@/woo'), PHP_EOL;