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  1. or download this
    $ perl -e '$_="foobar_";s/[^a-zA-Z]+$//;print'
foobar
...

$ perl -e '$_="foobar9";s/\W+$//;print'
foobar9
  2. or download this
    $ perl -e '$_="foobar_";s/[[:^alpha:]]+$//;print'
foobar