Java Regex Substring
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Hi i have a string and would like to extract a sub-string that matches a regex the code i currently have removes the sub-string i want it to be the only part that should be kept.

What i have, this removes it, i want to keep it:

    String ticketReference = "You have been assigned to the following Support Ticket: ST-00003 bla bla bla";
    
    ticketReference =  ticketReference.replaceAll("'((ST-)[0-9]{5})", " ");

Desired Output : "ST-00003"

Thanx in Advance 