AutoInput Regex & autoinput

Hi,
I'm using auto input, with UI query to get some pieces of information from my screen. Unfortunately I am not able to use the regex to "filter" some information from it.
For instance the information i catch is : "John Doe". And I would like to keep only "john". So I wanted to use something like \[A-Za-z]{1,}\g
But it still gives me John Doe. I checked the "regex" box and add the regex in the text field.

Does someone succeed in getting the regex to filter information ?

Best

 

Any guess? :/