Re: Counting number of regular expressions matches

2021-04-09 Thread Mitacha via Digitalmars-d-learn

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.


Counting number of regular expressions matches

2021-04-09 Thread Alain De Vos via Digitalmars-d-learn

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 ?