$re = '/^((8|\+994|\+374|\+375|\+7|\+996|\+373|\+992|\+993|\+998)[\- ]?)?\(?\d{3,5}\)?[\- ]?\d{1}[\- ]?\d{1}[\- ]?\d{1}[\- ]?\d{1}[\- ]?\d{1}(([\- ]?\d{1})?[\- ]?\d{1})?$/';
$str = '+7 900 000 00 00';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php