I don't write any Perl scripts these days, but I still use Perl one-liners frequently at a Bash command prompt and in Bash shell scripts.

Example: Convert Windows newlines to UNIX newlines: $ ... | perl -p -e 's/\r\n/\n/g' | ...

My brain is too full to remember how to do similar regexy transformations using sed, but I know it can be done.