On Sunday, 16 July 2017 at 17:03:27 UTC, unDEFER wrote:
[snip]How to write in D grep not slower than GNU grep?
GNU grep is pretty fast, it's tough to beat it reading one line at a time. That's because it can play a bit of a trick and do the initial match ignoring line boundaries and correct line boundaries later. There's a good discussion in this thread ("Why GNU grep is fast" by Mike Haertel): https://lists.freebsd.org/pipermail/freebsd-current/2010-August/019310.html