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<?php
var_dump( preg_match("/[\S\b]{2,32}/",'ج') );
echo '<hr />';
var_dump( preg_match("/[\S\b]{2,32}/",'Öйú') );

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<?php
var_dump( preg_match("/[\S\b]{2,32}/u",'ج') );
echo '<hr />';
var_dump( preg_match("/[\S\b]{2,32}/u",'Öйú') );
echo '<hr />';
var_dump( preg_match("/[\S\b]{2,32}/u",'§¥§â§Ñ§Ü§à§ß') );
echo '<hr />';
var_dump( preg_match("/[\S\b]{2,32}/u",'cc') );