Check To See If AlphaNumber Characters Have Been Entered

I want to check if non-special characters have been entered into a textbox.

I created a workflow that when the textbox value is changed and This input’s value:Extract with Regex:Count>0

with a Regex value of “^[a-zA-Z0-9]*$”

Obviously this is wrong. How can I code this so that when the textbox value is changed (either when a character is entered or when the tab or enter key is used to exit out of the element), the system will verify that the value doesn’t contain an alphanumeric character?

Think I figured it out - instead of Count>0, I did :First Item Is Not Empty. And I changed the Regex to .[a-zA-Z0-9].. It appears to be working.

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