Since you're using 'say', you have to use '-E' instead of '-e'.
Oops!
it will either remove a leading '(' or a leading '--', '-+', '+-' or '--')
Oops!
[+-]{2} is not equivalent to \+\+|--
Indeed, but I deemed it acceptable.
if you're golfing, you shouldn't make a capture if you aren't using the result.
Not until Perl6. /...(?:...|...)/ is longer than /...(...|...)/. (Multiplying out the leading subexpression would have been shorter, but that's not the issue you raised.)
I take your 69 and give you 51:
perl -nE'/[-+(]*(\S{3,}->\S{5,})/&&say$1' *|sort -u
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