Sharepoint 2010 InfoPath form validation

Question

I need to set validation in Sharepoint 2010 Infopath form single line text box as field only allows 5 Alpha and Numeric character types.

For limiting char I followed below step.

Using textbox properties -> Display ->Limit textbox to x Char

I don’t know how to allow only Alpha and Numeric char not allow all special char.

Answer 1

I got solution for my question.

1. Open the form in InfoPath designer.
2. Click on the textbox to add a validation rule.
3. Set the condition as Field does not match pattern.
4. Select the custom pattern and enter ([A-Za-z0-9])* in the custom pattern text box.

Reference Click Here