Regex - list of matches to single item

I am extracting ONLY alphabetic characters from an Input field with Regex. The expression is

[\w]+

How can I get john, doe, red, car to extract as johndoeredcar ?

Is it possible to reference one of the CSV values in the Regex list?

[\w]+ = john, doe, red, car

can I somehow reference those items (like :item # in RG)?

I found a solution so I’m opting it to Tips to help others.

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