Question

this is my current regex code to validate english & numbers:

const CANONICAL_FMT = '[0-9a-z]{1,64}';

public static function isCanonical($str)
{
    return preg_match('/^(?:' . self::CANONICAL_FMT . ')$/', $str);

}

Pretty straight forward. Now i want to change that to validate only hebrew, underscore
and numbers. So i changed the code to:

public static function isCanonical($str)
{
    return preg_match('/^(?:[\u0590-\u05FF\uFB1D-\uFB40]+|[\w]+)$/i', $str);

} 

But it doesn’t work. I basically took the hebrew UTF range out of Wikipedia.
What is Wrong here?

Answer 1

I was able to get it to work much more easily, using the /u flag and the \p{Hebrew} Unicode character property:

return preg_match('/^(?:\p{Hebrew}+|\w+)$/iu', $str);

Working example: http://ideone.com/gSlmh