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On 20/06/2011 13.13, steve donovan wrote:
On Mon, Jun 20, 2011 at 12:12 PM, Lorenzo Donati <[email protected]> wrote:if pcre.match( haystack, "^foo|bar$" ) then ... may be rewritten in pure Lua as: if haystack:match "^foo$" or haystack:match "^bar$" then ...Ah, but soon as you get multiple alternation, especially nested, then the resulting code is not so obvious. And obviously it is going to be slower than any regexp implementation. OK, that may be acceptable for the application, but the code generation could get hairy fast.
I had that feeling, unfortunately :-(
Another idea is to use LPeg to implement a regexp subset - that should be fast. But it does require non-triivial knowledge of LPeg which I understand is not on your immediate to-do list ;) steve d.