Replacing tango.text.Ascii.isearch

[Siarhei Siamashka]

On Friday, 7 October 2022 at 00:57:38 UTC, rassoc wrote:
> On 10/7/22 01:39, torhu via Digitalmars-d-learn wrote:
>> regex is about ten times faster then.
>
> Interesting! Using your code, I'm seeing a 1.5x max difference 
> for ldc, nothing close to 10x. Welp, the woes of superficial 
> benchmarking. :)

Benchmark results depend on many things, such as the actual text 
in both needle and haystack and the needle length. Are we dealing 
with unicode text by the way? One example is searching for 
something like "äußere" in 
https://www.gutenberg.org/ebooks/6343.txt.utf-8

If it's the source code, then searching for 
"sqlite3_value_bytes16" in the sqlite3.c file from 
https://www.sqlite.org/2022/sqlite-amalgamation-3390400.zip may 
be a good test too.

I'm getting at least 5x difference in favor of regex with LDC on 
these two examples.

Also are we allowed to artificially construct needle and haystack 
to blow up this test rather than only benchmarking it on typical 
real data?