Case-Insensitive RegularExpressionValidator

[melimae]

I am trying to use a regularexpressionvalidator to verify that a valid state abbreviation was entered. I want it to be case insensitive. Below is my control, but it is not working correctly. I get a syntax error.

<asp:RegularExpressionValidator ControlToValidate="txtBankState" ID="valStateLen" runat="server" ErrorMessage="Please enter a valid state." ValidationExpression="(?i:A[LKSZRAEP]|C[AOT]|D[EC]|F[LM]|G[AU]|HI|I[ADLN]|K[SY]|LA|M[ADEHINOPST]|N[CDEHJMVY]|O[HKR]|P[ARW]|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY])" text="*"/>

I have also tried
ValidationExpression="(?i)(A[LKSZRAEP]|C[AOT]|D[EC]|F[LM]|G[AU]|HI|I[ADLN]|K[SY]|LA|M[ADEHINOPST]|N[CDEHJMVY]|O[HKR]|P[ARW]|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY])"

and ValidationExpression="(A[LKSZRAEP]|C[AOT]|D[EC]|F[LM]|G[AU]|HI|I[ADLN]|K[SY]|LA|M[ADEHINOPST]|N[CDEHJMVY]|O[HKR]|P[ARW]|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY])"

The last one works, but only for capital letters.

I have also tried using style="text-transform:uppercase" on my text box control but the regularexpressionvalidator does not work when I use it.

Any help is greatly appreciated.

 

[ca8msm]

If you've got RegEx problems,

http://regexlib.com/

is a great resource for finding out they different syntax that you can use.

Also, try looking at Listing 3.9 in this article:

http://www.samspublishing.com/articles/article.asp?p=101137&seqNum=3&rl=1

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[BoulderBum]

If you want to use the built-in RegularExpressionValidator, you'll have to accomodate for case in the expression.

For instance, instead of:

^(A[LKSZRAEP]|C[AOT])$

You'd have to do something like:

^([Aa][LlKkSsZzRrAaEePp]|[Cc][AaOoTt])$

You have two alternatives, however, which are:

1. Implement your own validation via a CustomValidator control where you use RegexOptions.IgnoreCase on the server validation, and /i in the ClientValidationFunction.

2. Better yet, use a DropDownList with all the possible state abbreviations. You help guard against junk data in that case and it's more usable besides.