Some thoughts:
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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.
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I don't get where the $tgt $tgtf $tgtl variables are defined and initialized: what are these supposed to represent? Do you have any philosophical objection to running with strict and warnings enabled?
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(Update: The /c$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.
Give a man a fish: <%-{-{-{-<
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