Some thoughts:

• There is no  || regex operator. More precisely,  || resolves to a pair of  | regex alternation operators with a null pattern between them, and the  // null regex pattern matches everything, so no surprise about the junk.
• I don't get where the   $tgt  $tgtf  $tgtl variables are defined and initialized: what are these supposed to represent? Do you have any philosophical objection to running with strict and warnings enabled?
• (Update: The  /c$tgt || c$tgtf || c$tgtl || $tgtf || $tgtl / regex has embedded literal spaces. I don't know if this is intentional, but you may want to investigate the  /x regex modifier; see Modifiers.)

Can you supply a short, representative chunk of the sample input data you wish to process and its desired final form? I think that would help greatly to define the problem.

Update: Various small wording and spelling fixes.