$re = '/^(?|(((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}|(38\(026\)123-45-67)|\+380 123 45 67))$/m';
$str = '+79261234567
89261234567
79261234 567
+380 123 45 67
38(026)123-45-67
9261234567
79261234567
(495)1234567
(495) 123 45 67
89261234567
8-926-123-45-67
8 927 1234 234
8 927 12 12 888
8 927 12 555 12
8 927 123 8 123
Пример с условием
/(?|(candy)|(kiss)|(berry))/g
A candy, kiss, or even a berry is delicious.
$1 =candykissberry ';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($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