Am 19.06.2018 um 19:44 schrieb Taylor Blau: > On Tue, Jun 19, 2018 at 07:33:39PM +0200, René Scharfe wrote: >> Am 19.06.2018 um 18:35 schrieb Jeff King: >>> On Mon, Jun 18, 2018 at 06:43:01PM -0500, Taylor Blau wrote: >> We could add an optimizer pass to reduce the number of regular >> expressions in certain cases if that is really too slow. E.g. this: >> >> $ git grep -e b -e a >> >> ... is equivalent to: >> >> $ git grep -e '\(b\)\|\(a\)' >> >> In that example the optimizer should use a single kwset instead of a >> regex, but you get the idea, namely to leave the short-circuiting to the >> regex engine or kwset, which probably do a good job of it. > > I think that--while this pushes that decision to the appropriate level > of indirection--that it is out of scope for this series, and that the > above patch should do a sufficient job at not surprising users. Definitely. I'm not even convinced that performance problem is real -- otherwise someone would have added such an optimization already, right? :) René
