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I want to test a regular expresion like this: 213+123, a number plus + plus a number. This is de code:

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

The code respond false if I try to enter 234+234. Any help

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  • Your regex is True seems that the problem is because of your functions Commented Jul 20, 2015 at 21:23
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    Shouldn't it be re.test(command)? If you eval 213+123, you get back the result of the expression, which is a single number. Commented Jul 20, 2015 at 21:23
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    Just a note that using eval is not safe with user input. I have written a sumup function that does the parsing in a safer manner. Commented Jul 20, 2015 at 21:53
  • @stribizhev: evaling the user's own input is not unsafe... after all, they could also just type the code in the console. Commented Jul 21, 2015 at 17:55

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The problem is not the regex but the eval.

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

Instead call it on the command

var command = "234+234";
var bool = re.test(command); // equals re.test("234+234");
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I trying to evaluate the result, no the expresion. Thanks'alls

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