Counting number of regular expressions matches

[Mitacha]

On Friday, 9 April 2021 at 15:01:58 UTC, Alain De Vos wrote:
> I've got,
> import std.regex: regex,matchAll;
> ...
> string regfiltertext="\\b"~entryfilter.getText()~"\\b";
> auto reg = regex(regfiltertext);
> auto result = name.strip("_").matchAll(reg);
> int t=0;
> foreach (c; result) t+=1;
>
> This make t the number of regular expressions matches.
> Is there a better way to have the number of matches ?

`matchAll` returns `RegexMatch` which is a ForwardRange, so it 
should be possible to get it's length using `walkLength`.
```d
     auto r = regex(`([a-z])a`);
     auto result = "banana".matchAll(r);
     writeln(result); // [["ba", "b"], ["na", "n"], ["na", "n"]]
     writeln(result.walkLength); // 3
```
I'm not familiar with using matches with `std.regex`, but I hope 
this solves your problem.