[ruby.parslet] Improving erb like parser text parsing performance

[Eric Sagnes]

Hello,

I was playing with the erb sample parser in the repository and I noticed that 
the parsing is quite time consuming even if the string to parse is just plain 
text (without any erb tags).

For example, parsing a 25000 characters plain text, takes on my machine 1.3 
seconds.

For information, removing the "str('<%').absent?" from the :text rule and 
parsing the same string takes about 0.5 seconds.

For erb like parsers, having long plain text is quite usual, and I was 
wondering what would be the most efficient way to parse it?

Thanks in advance,
-- 
Eric Sagnes
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