Function to check the format of a telephone number (VB ASP.NET)

People have different thoughts on how they should enter a telephone number into a field on a web form. Some people may enter the number as (nnn) nnn-nnnn and some as nnn-nnn-nnnn and some may omit the area code entirely. Since database formats need to be consistent and field sizes should be kept to a minimum, I found it necessary to write a function to validate telephone number fields before posting them to a database. I prefer the nnn-nnn-nnnn format so that is what I used with this example. This VBScript example accepts a string as the input parameter and returns the Boolean value of True or False.

 

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