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Comment by codesnik | Hacker News Reader

and, AFAIR, in perl space and enter could be delimiters too! I think I've used it in some perlgolf task which didn't count whitespace.

and memory tricked me. Whitespace doesn't work for regex and quoting terminators.

Works in Ruby:

  irb(main):001:1/ puts(%r
  irb(main):002:1* a+
  irb(main):003:0> .match? %q aaa )
  true