How to restrict specific combination of characters in afield

Aurobinda Tripathy

I don't want to allow, any alphabet exactly after < in a textbox/textfiled.

User should not be able to submit if he/she enters "

For Example

Don't allow -

1) k

3) 1

4) ceK<<<<<

Allow -

1) <

2) k<

3) l>

4) K<

5) )1w<.l

6) d<1b

7) B<,e

8) .kk<<<<<>a

C# Code -

[AllowHtml]

[RegularExpression(@"X", ErrorMessage = "Error Message for Don't allowed Text")]

public string Textbox { get; set; }

Please provide the value of X, which will meet my rquirement.
Note - The solution should work for multiline textbox also.

2 Replies

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Aurobinda Tripathy6y ago
Thanks for yor suggestion. I want to achive that using regular expression only. The solution which you provided it will also show the error message for the examples which I have mentioned in the allowed text expampes.
0
Arvind Kushwaha6y ago
Hi Aurobinda,

You can solve your problem like this.

After getting the textbox value check the occurance of < and if found return the error else continue.

eg.

textBoxValue = "ABC

if(textBoxValue.indexOf("<")>-1) {
Show the error message
}
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