Re: LPEG and the order of alternatives in ordered choice

[Peng Zhicheng <pengzhicheng1986@...>]

On 09/11/2014 11:26 AM, Paul K wrote:
> Hi Peng,
>
> > I suppose for patterns other than of single character, the order really
> > should affect the perfomance. could you test it again using complex patterns?
> Thank you for the explanation. I tested on 10-char patterns, but
> '1'-first performs better than 'a'-first on some tests (20-50
> iterations for 100M char string).
>
> lpeg.match((lpeg.S('1111111111')+lpeg.S('aaaaaaaaaa'))^0, str)
>
> Anything else I should try?
>
> Paul.
you shoud try lpeg.P('aaaaaaa'). the S of lpeg.S stands for ``set``.