I have a file upload control in my application. The user can upload a file starting with alphabets as well as numerals. However, while uploading a file with numbers ,it is giving error. I have the following validation expression:
ValidationExpression="[a-zA-Z\\].*(.txt|.csv|.CSV)$"
How can I include the validation for numbers also? I tried 0-9 as below , but it didn' worked.
[a-zA-Z0-9\\]
Please help
I have a file upload control in my application. The user can upload a file starting with alphabets as well as numerals. However, while uploading a file with numbers ,it is giving error. I have the following validation expression:
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