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I am using the "New" number textbox mode that is available for sites running .NET 4.5 and I am attempting to validate user input with the asp.net validation controls. I am able to validate that the number chosen falls within a specified range (1-254) with the following REGEX expression:

^([1-9]?[0-9]|1[0-9][0-9]|2[0-4][0-9]|2[5][0-6])$

This expression should also validate that the input is of numeric value and does not contain characters. For some reason the validation for the range works appropriately, but if I input "A" or any other character string it will return as valid.

If I remove the TextMode="Number" property from the textbox everything works as it should. Has anyone else run across this bug?

If I access the site in an older browser which ignores the new textbox textmode, validation works appropriately.

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    Don't use regex to validate number in a range. It is very unreadable. Commented Sep 17, 2013 at 18:50
  • Have you tried range validator instead? Commented Sep 17, 2013 at 19:40
  • I used the range validator but ran into the same issue where it would not invalidate letters. I thought that by switching to REGEX it might fix the issue, but it does not seem to be the case. I could absolutely switch back to range validators but it would leave me with the same issue. Commented Sep 19, 2013 at 14:56
  • can you not validate that it is a number AND validate that it is in range? Two validators on one input is possible yeah? In the past, for example, I'd have to validate with a 'required' and a regex validator when validating emails. Commented Oct 10, 2013 at 15:54
  • This may be an option, I think for now I just stuck with using the old textbox modes because the new modes are not supported by all browsers. Commented Oct 11, 2013 at 17:38

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It sounds like you want two validators for this textbox, one, that the entered value is a number (comparevalidator with operator set to data type check and type set to integer), and one that the number is within a given range (rangevalidator with appropriate min/max values).

Is there a reason that you need to combine both checks in a single validator?

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I don't believe setting the textbox mode to "Number" causes validation. It simply extends the box with arrows to increment/decrement the value. You can still type in a letter or other symbol if you want.

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