I have Geany and I assume it uses PCRE regex. I have a list of lines that looks something like this:

Kurt Phoebe ColtKurt Phoebe Colt
Lane AnselLane Ansel
Taylor Retha EvansTaylor Retha Evans
Hilary Mitchell StephensonHilary Mitchell Stephenson
Lizzie EasonLizzie Eason
Freida DurandFreida Durand
Zelma Ibbie ThompkinsZelma Ibbie Thompkins
Felicity MarvinFelicity Marvin
Kira Norma BlackmanKira Norma Blackman
Marcia RickardMarcia Rickard

Some of the words have punctuation but each line has a duplicate string with no space separating it.

How can I use regex to find the duplicate strings?