- mb_strlen: documentation ( source)
- preg_match: documentation ( source)
<?php
$a = "this is sachinĂ¹s school of sachin";
$pattern = "sach";
if(preg_match("/[^ [:punct:]]*".$pattern."([^ [:punct:]]*)/u", $a, $match))
print(mb_strlen($match[1], "UTF-8"));
?>