language: PHP (php 5.4.4)
date: 698 days 2 hours ago
link:
visibility: public 
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<?php
 
function isCanonical($str)
{
    return preg_match('/^(?:\p{Hebrew}+|\w+)$/iu', $str);
}
 
echo isCanonical('hello');
echo isCanonical('hello1234');
echo isCanonical('שלום');
echo isCanonical('שלום123');
 
?>