'@')); Assert::same('@o wor@d!', Strings::replace('hello world!', '#[e-l]+#', Closure::fromCallable('Test::cb'))); Assert::same('@o wor@d!', Strings::replace('hello world!', ['#[e-l]+#'], Closure::fromCallable('Test::cb'))); Assert::same('@o wor@d!', Strings::replace('hello world!', '#[e-l]+#', ['Test', 'cb'])); Assert::same('#@ @@@#d!', Strings::replace('hello world!', [ '#([e-l])+#' => '#', '#[o-w]#' => '@', ])); Assert::same(' !', Strings::replace('hello world!', '#\w#')); Assert::same(' !', Strings::replace('hello world!', ['#\w#'])); // flags & callback Assert::same('hell0o worl9d!', Strings::replace('hello world!', '#[e-l]+#', fn($m) => implode('', $m[0]), captureOffset: true)); Assert::same('žl1uťoučk7ý k10ůň!', Strings::replace('žluťoučký kůň!', '#[e-l]+#u', fn($m) => implode('', $m[0]), captureOffset: true, utf8: true)); Strings::replace('hello world!', '#e(x)*#', fn($m) => Assert::null($m[1]), unmatchedAsNull: true); // utf-8 without modifier Assert::same('* *', Strings::replace('Россия агрессор', '#\w+#', fn() => '*', utf8: true)); Assert::same('* *', Strings::replace('Россия агрессор', '#\w+#', '*', utf8: true)); Assert::same('* *', Strings::replace('Россия агрессор', ['#\w+#'], '*', utf8: true));