PHP Regular Expression for Bengali Word/Sentence

I am developing a web application using PHP 5.3.x. Everything is working fine, but unable to solve an issue due to regular expression problem with Bengali Punctuation. Following is my code:

$value          = 'u09ACu09BEu0982u09B2u09BEu09A6u09C7u09B6';
$value          = mb_convert_encoding($value, 'UTF-8', 'UTF-16BE');
//$value            = 'বাংলাদেশ';
//$value            = 'Bangladesh';

$pattern        = '/^[p{Bengali}]{0,100}$/';
//$pattern      = '/^[p{Latin}]{0,45}$/';

echo preg_match($pattern, $value);

Whether I pass Bengali word or not, it always returns false. In JavaEE application I used this Regular Expression

p{InBengali}

But in PHP it not working! Anyways how do I solve this problem?

Answer

Maybe this will help you:

The PHP preg functions, which are based on PCRE, support Unicode when the /u option is appended to the regular expression.

From regex in Unicode