Ooh, right, thanks for pointing that out. Let's see... 
start:
  exactf "f", find_o
  advance quit
  goto start

find_o:  # non-greedy, by the way
  goto find_bar

find_o_real:
  exactf "o", find_o
  goto start

find_bar:
  exactf "bar", done
  goto find_o_real

done:
  end

quit:
  fail

[download]
I should point out that I haven't optimized find_o out for readability purposes, and that in "real life", this would look like: 
start:
  exactf "f", find_bar
  advance quit
  goto start

find_o_real:
  exactf "o", find_bar
  goto start

find_bar:
  exactf "bar", done
  goto find_o_real

done:
  end

quit:
  fail

[download]
This feels like drawing a DFA... honestly. I'm not sure where save and restore are going to come into play in this particular example -- it seems not at all.

_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Re: Re: Flattening REs into opcodes for Perl 6 by japhy
in thread Flattening REs into opcodes for Perl 6 by BrentDax

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