How to find the right function in the Phobos library?

[Ron Tarrant]

On Saturday, 17 August 2024 at 05:28:37 UTC, Bruce wrote:
> Example.
> I want to find the index of an item in an array.
```
import std.stdio;
import std.string;

void main()
{
    string text = "Hello, World!";
    string searchSubstring = "World";

    ptrdiff_t index = text.indexOf(searchSubstring);

    if (index != -1)
    {
       writeln("The substring '", searchSubstring, "' found at 
index ", index);
    }
    else
    {
       writeln("The substring '", searchSubstring, "' not found in 
the string.");
    }
}
```