- Foreach: came from csh
- Regular expressions: borowed from sed/awk/etc., plus lots of academic research before that
- Closures: LISP and other functional languages
- map/grep: LISP again
- Virtual Machines (like Parrot): Java had one first, and Scheme and other LISP varients before that
- Hashes: significant academic research before Perl got them. I'm not sure if anyone integrated them (or other types of associative arrays) so closely into the langauge before Perl did.
It would be hard to come up with a language feature that Perl invented itself. Maybe psedo-hashes, but that's not exactly something to be proud of. Creative and academic endeavors always build on previous efforts.
"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.
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