note 114922 added to function.eval

with reference to the problem of mathematic equations validation , as an operator is not a good idea... i've removed the comma from operators and added the optional group (,(?1))? to validate functions like pow(2,3) $operators = '[\/*\^\+-]'; // Allowed math operators $regexp = '/^([+-]?('.$number.'|'.$functions.'\s*\((?1)+(,(?1))?\)|\((?1)+\))(?:'.$operators.'(?1))?)+$/'; // Final regexp, heavily using recursive patterns ---- Server IP: 72.52.91.14 Probable Submitter: 194.184.102.210 ---- Manual Page -- http://php.net/manual/en/function.eval.php Edit -- https://master.php.net/note/edit/114922 Del: integrated -- https://master.php.net/note/delete/114922/integrated Del: useless -- https://master.php.net/note/delete/114922/useless Del: bad code -- https://master.php.net/note/delete/114922/bad+code Del: spam -- https://master.php.net/note/delete/114922/spam Del: non-english -- https://master.php.net/note/delete/114922/non-english Del: in docs -- https://master.php.net/note/delete/114922/in+docs Del: other reasons-- https://master.php.net/note/delete/114922 Reject -- https://master.php.net/note/reject/114922 Search -- https://master.php.net/manage/user-notes.php