How to check if an input box contains only numbers or commas?

Question

Given:

 var input_val = $('#field').val();

How do I check whether input_val contains only numbers or commas? The solution must work in the 4 main browers.

There was a similar post to this a couple of years ago. http://stackoverflow.com/questions/4246077/simple-problem-with-regular-expression-only-digits-and-commas — Gaz Winter, Jun 13 '12 at 10:22
Do you mean "digits" (e.g. `0`, `1` etc) or "numbers" (e.g. `-3.14`)? — georg, Jun 13 '12 at 10:24
Perhaps large US numbers like `1,000,000` or numbers with European decimal point: `3,14` - we will not know unless @Hard worker works harder on how he asks questions ;) And actually it sounds like homework even, so how hard does hard worker works? — mplungjan, Jun 13 '12 at 10:54

score 1 · Accepted Answer · answered Jun 13 '12 at 10:23

1

/^(\d|,)+$/.test(input_val) will return true as long as input_val only contains digits and/or commas.

answered Jun 13 '12 at 10:23

mVChr

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score 0 · Answer 2 · answered Jun 13 '12 at 10:23

0

Use the following function

function containsNumbersAndCommasOnly(str) {
     return /^[0-9,]+$/.test(str);
}

by calling

if (containsNumbersAndCommasOnly(input_val)) {

}

answered Jun 13 '12 at 10:23

Dan Lister

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2

`1,,,,,,,,,,,,,,,,,,,,,9` will pass this too – mplungjan Jun 13 '12 at 10:52

score 0 · Answer 3 · edited May 23 '17 at 12:08

This is a combination of the response from @Adil and a community post answer from a different post. The combination of the two works better than either individually but there are still some issues... 12,12,12 would be valid here so would 1,,,,,,,,,9 as pointed out as @mplungjan.

For my purposes this is as far as I am willing to go but someone good with regex might add a solution that detects for single instances of commas followed but not preceded by a minimum of 3 digits.

if(!(!isNaN(parseFloat(n)) && isFinite(n))){
    return /^(\d|,)+$/.test(n);
}else{
    return true;
}

How to check if an input box contains only numbers or commas?

3 Answers3