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@ 2019-07-17T17:00:53Z

<?php

$exp = (1+2*3)+4;
if(preg_match('~^[0-9()+\-*\/]+$~', $exp)){
  eval("echo $exp;");
} else {
   echo "Bad Expression!";
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

29.63 ms | 404 KiB | 5 Q