<?php

error_reporting(-1);

$text = "Жыть сдесь хорошо,но жить вобще прекрасно!";
$regexp = '/жы|сдесь|,[а-я]|вобще/u';
$mistakes = array();
$lowerCase = mb_strtolower($text);
//$mistakes = preg_match_all($regexp, $lowerCase, $mistakes);

if (preg_match_all($regexp, $lowerCase, $mistakes)) {
	echo("Grammatically incorrect!\n");
	foreach ($mistakes as $keys => $value) {
		foreach ($value as $number => $mistake) {
		echo "Найденная ошибка: {$mistake}\n";
		}
	}

} else {
	echo("Absolutely correct!");
}