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Asked: 2026-06-04T22:46:48+00:00

I have a little problem to obtain a regular expresion which satisfy the fact

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I have a little problem to obtain a regular expresion which satisfy the fact that match the exact number base on a list and the number is positive, at the beginning I was working with the following:

<!DOCTYPE html>
<html>
<body>

<script type="text/javascript">
    var patt1=/\b(100|101)/g;

    var str="-101";
    document.write(str.match(patt1));
    document.write("<br/>");
    var str="101";
    document.write(str.match(patt1));

</script>

</body>
</html>

But I realized that in this case it will return 101 and -101 as valid. Then I tried 

var var patt1=/[^-]\b(100|101)/g;

but the result was null for both cases, then 

var patt1=/(^-)\b(100|101)/g;

but the result instead of being null and then 101 was the opposite -101 null.
I want the 101 and not the -101 any idea about how to do this.

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1 Answer

  1. Editorial Team

    You can use this regex

    var patt1 = /^(100|101)$/;

    It excepts only 100 or 101 as a valid input.

    But for this simply test, I would use:

    if (str === "100" || str === "101")
    // Do something.
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