On Friday, 9 January 2015 at 14:03:21 UTC, ketmar via
Digitalmars-d-learn wrote:
std.regex can use CTFE to compile regular expressions (yet it
sometimes
slower than non-CTFE variant), and i mean that we compile
regexp before
doing alot of searches, not before each single search. if you
have alot
of words to match or alot of strings to check, regexp can give
a huge
boost.
sure, it all depends of code patterns.
even with CTFE regex still uses a state machine _mm256_cmpeq_epi8
will beat that even for multiple strings. Basically all lexer are
handwritten, if regex where fast enough nobody would do the work.
