Re: How to remove all characters from a string, except the integers?

[forkit via Digitalmars-d-learn]

On Friday, 4 March 2022 at 02:10:11 UTC, Salih Dincer wrote:
On Thursday, 3 March 2022 at 20:23:14 UTC, forkit wrote:
On Thursday, 3 March 2022 at 19:28:36 UTC, matheus wrote:

I'm a simple man who uses D with the old C mentality:
[...]
```d
    string s, str = "4A0B1de!2C9~6";
    foreach(i;str){
        if(i < '0' || i > '9'){ continue; }
        s ~= i;
    }
```
[...]

mmm..but we no longer live in simple times ;-)

(i.e. unicode)

If you look 
[here](https://github.com/dlang/phobos/blob/master/std/ascii.d#L315), you'll see that it's already the same logic. If it were me I would have even written like this:
```d
"4A0B1de!2C9~6".filter!(c =>
                        '0' <= c && c <= '9'
                       ).writeln; // 401296
```

If you get this question at an interview, please remember to 
first ask whether it's ascii or unicode ;-)

" All of the functions in std.ascii accept Unicode characters but 
effectively ignore them if they're not ASCII." - 
https://github.com/dlang/phobos/blob/master/std/ascii.d