faster splitter

[Patrick Schluter via Digitalmars-d]

On Wednesday, 1 June 2016 at 12:41:19 UTC, Seb wrote:
> On Wednesday, 1 June 2016 at 12:14:07 UTC, Patrick Schluter 
> wrote:
>> On Tuesday, 31 May 2016 at 17:54:34 UTC, qznc wrote:
>>> There is a special version of find for searching a single 
>>> char in a string. Using a one-letter needle string is more 
>>> like a user mistake than something to optimize for.
>>
>> At compile time you may not know the length of the needle, 
>> like in the grep command.
>
> 1) how about a CTFE find?
>
What I wanted to say, is that in real life, the input of the 
search routine is very often run-time user provided data. Think 
of search box in browsers and apps, command line parameter à la 
grep, etc. The "string" search function should not 
catastrophically break down on special input, like 1 character 
strings, unusual Unicode or when needle==haystack. I only said 
this to not lose the focus on what is being tried to be achieved 
here.
It's often a danger of micro-optimization and unit test focused 
development, that a lot of time and effort are spent on 
improvements that are completely irrelevant when checked against 
what is really needed in real world (i.e. we're full in bike shed 
territory here).