Regular expression validator in asp.net

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I want to use a regular expression validator for a textbox in my website

The textbox must only accept number ranging from 5-20 and must be number with no any letters and others

please help me out to sort this out

thanks

Posted 5-Jan-16 10:10am

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Sergey Alexandrovich Kryukov · Answer 1 · 2016-01-05T10:43:00

Instead of using Regular Expression, I would suggest the following validation:

Compare the length of the input string with 5 and 20, check up if it's in the valid range. (You may want to trim the string before doing it.)

Check if this a valid number:

VB

Dim input As String = ' ...
Dim value As ULong
If ULong.TryParse(input, value) Then
    ' input is valid, and value is a valid number
End If

Why? Because one of your validation steps will also give you the numeric value for free; it's very like that you will need it. :-)

—SA

koolprasad2003 · Answer 2 · 2016-01-05T17:40:00

Solution 2

Checkout below regular expression, and check if it resolved
'\b1[5-20]\b'

Posted 5-Jan-16 17:40pm

koolprasad2003