Did you know; we need this operator!

[Salih Dincer]

On Saturday, 14 September 2024 at 01:01:06 UTC, Paul Backus wrote:
> This could also be solved by allowing `with()` to be used as an 
> expression, not just a statement:

In fact, if the D parser is not sufficient, you can make your own 
parser using a simple regular expression! Dconf'24 brought me 
such a perspective:


```D
import std.regex, std.stdio;

enum Days
{
   Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
};

void main()
{
   auto jsonStr = `{
       "Pazar": Sunday,
       "Pazartesi": Monday,
       "Salı": Tuesday,
       "Çarşamba": Wednesday,
       "Perşembe": Thursday,
       "Cuma": Friday,
       "Cumartesi": Saturday,
   }`;

   Days[string] Item;

   enum regex = `"(\w+)": (\w+),`;
   foreach (matches; jsonStr.matchAll(regex))
   {
     string key = matches.captures[1];
     string value = matches.captures[2];
     writefln("\"%s\": %s", key, value);
     Item[key] = value.indexOf!Days;
   }
   Item.writeln;
}

auto indexOf(E)(string value)
{
   import std.conv : to;

   E count;
   while (count < count.max)
   {
     if (count.to!string == value) break;
     ++count;
   }
   return count;
}

```
***Prints:***
```D
/*
"Pazar": Sunday
"Pazartesi": Monday
"Salı": Tuesday
"Çarşamba": Wednesday
"Perşembe": Thursday
"Cuma": Friday
"Cumartesi": Saturday
["Cumartesi":Saturday, "Pazartesi":Monday, "Pazar":Sunday, 
"Salı":Tuesday, "Çarşamba":Wednesday, "Perşembe":Thursday, 
"Cuma":Friday]

Process finished.
*/
```

SDB at 79