From: Tom Sawyer <transami@...>
Date: 2002-07-11T02:07:51+09:00
Subject: Re: String#split converts string args to regexes -- ?

ummm..the thread is called String#split converts...

but i am suprised with my #index results: it is about 4x as fast with a
regexp versus a string.

how is this possible? split is around 4x times faster with a string, but
index is 4x as slow?

even if regexp is highly optimized, it must still entail some overhead
that a pure string can do without, but perhaps the difference it's quite
small. yet, the split example makes me wonder.

what's going on here?

~transami


On Wed, 2002-07-10 at 10:46, ts wrote:
> >>>>> "T" == Tom Sawyer <transami@transami.net> writes:
> 
> T> 	s = "xyz" * 1000000
> T> 	a1 = s.split('y')
> 
>  It don't use String#index in this case
> 
> T> On Wed, 2002-07-10 at 09:24, Yukihiro Matsumoto wrote:
> >> Hi,
> >> 
> >> In message "Re: String#split converts string args to regexes -- ?"
> >> on 02/07/10, Tom Sawyer <transami@transami.net> writes:
> >> 
> >> |and, if implemented without regexps, could easily boost performance,
> >> |which IMHO is an important bonus considering speed is probably the
> >> |primary site against ruby in comparison to perl and python.
> >> 
> >> regex is highly optimized for searching.  search using regex
> >> (e.g. str.index(/pat/)) is almost always faster than search using
> >> strings (e.g. str.index("pat")).
>             ^^^^^^^^^^^^^^^^^^^^^
> 
> 
> 
> Guy Decoux
> 
-- 
~transami

"They that can give up essential liberty to obtain a little
 temporary safety deserve neither liberty nor safety."
	-- Benjamin Franklin