regex - Regexp in Javascript -

i want test regular expresion this: 213+123, number plus + plus number. de code:

var re = /\d+[+]\d+/ result = window.eval(command); var bool = re.test(result); 

the code respond false if try enter 234+234. help

the problem not regex eval.

var command = "234+234"; var result = window.eval(command); // result 468 regex fail var bool = re.test(result); // equals re.test(468); 

instead call on command

var command = "234+234"; var bool = re.test(command); // equals re.test("234+234");