Regex validation on integer field

[richard38]

Hello, I'm trying add some validation to an integer field. The validation is for positive, whole numbers. I've found a regex example that works, but only for numbers 1-999.

      var regExTest = /^[1-9][0-9]*$/;      

      g_form.hideFieldMsg("u_regex_test", true);

      if(!regExTest.test(newValue)){

              g_form.setValue("u_regex_test", "");

              g_form.showFieldMsg("u_regex_test","Enter a valid integer", "error");      

      }

My understanding is that the '*' represents the number of items being validated, similar to adding {0, } for min/max numbers. I've tried this in various online regex validators and they all show that this validates correctly, but it doesn't work as anticipated. Am I missing something?

thank you

[richard38]

Thanks Abhinay, but this allows negatives and decimals.

[Abhinay Erra]

I don't think this will allow negatives numbers and decimals. Because the meta character \D will return true if there is any non digit character that include '-' and '.'

[drjohnchun]

Richard - the regex you have is correct and it has nothing to do with limiting to 999. I suspect the validation logic besides the regex may be the source of limitation. Your regex says

var regExTest = /^[1-9][0-9]*$/;

1. it must start with a number 1 through 9 (this eliminates 0).
2. the first digit may be followed by 0 or more digits 0 through 9.

In fact, it has no limit on the number of digits.

Please feel free to connect, follow, mark helpful, like, endorse.

John Chun, PhD PMP

[drjohnchun]

You may want to check if "newValue" is being truncated before being tested.

[Chuck Tomasi]

FYI - we just did part 1 of 2 on regular expressions on TechNow Ep 31 yesterday. Part 2 is in a few weeks.

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