Question

I am trying to create a jquery validation for number.

It should allow 4 digit first and then after decimal point it should allow 1 digit.

For decimal my code is working fine:

$.validator.addMethod('Decimal', function(value, element) {
    return this.optional(element) || /^[0-9,\d{4}]+(\.\d{0,1})?$/.test(value); 
  }, "Please enter a correct number, format xxxx.X");

I may be making mistake in regular expression.

Answer 1

For exactly NNNN.N (1234.5) use:

/^\d{4}\.\d$/

For optional .N (1234 1234. 1234.5) go with:

/^\d{4}(\.\d?)?$/

For numbers up to size of NNNN.N (1 .5 12.5 123. 1234 1234.5) go with:

/^(?=.*\d)\d{0,4}(\.\d?)?$/

And if you want to allow +/- at the beginning, then replace ^ with ^[-+]?.