[xonea]

You have to tell perl to expect utf8 from stdin (switch -C).

  $ echo '੧' | perl -C -pe 'print "yes: " if m/\d/'
  and
  $ perl -e 'use utf8; print "yes\n" if "੧" =~ m/\d/;'

both work :)

[pooriaazimi]

`man perlunicode` is chockfull of utf8-related stuff (and it's looong): http://perldoc.perl.org/5.14.0/perlunicode.html