Hi All,

   Request your help on how to extract sub string from a string, below is an example in PHP, need your help on how to do the same in D.

$text = "welcome2worldinfo";
$hg = strtoupper(substr($text , 0, 7).'-'.substr($text, 7, 1).'-'.substr($text, 8, 5));
print_r($hg) \\ Output : WELCOME-2-WORLD

From,
Vino.B

On Monday, 9 November 2020 at 16:00:28 UTC, Vino wrote:
> Hi All,
>
>    Request your help on how to extract sub string from a string, below is an example in PHP, need your help on how to do the same in D.
>
> $text = "welcome2worldinfo";
> $hg = strtoupper(substr($text , 0, 7).'-'.substr($text, 7, 1).'-'.substr($text, 8, 5));
> print_r($hg) \\ Output : WELCOME-2-WORLD
>
> From,
> Vino.B

Strings in D are actually immutable arrays of chars, so you can slice them to get a substring:

import std.string : toUpper;

string text = "welcome2worldinfo";
string hg = toUpper(text[0..7] ~ "-" ~ text[7..8] ~ "-" ~ text[8..13]);
writeln(hg);

On Monday, 9 November 2020 at 16:00:28 UTC, Vino wrote:
> Hi All,
>
>    Request your help on how to extract sub string from a string, below is an example in PHP, need your help on how to do the same in D.
>
> $text = "welcome2worldinfo";
> $hg = strtoupper(substr($text , 0, 7).'-'.substr($text, 7, 1).'-'.substr($text, 8, 5));
> print_r($hg) \\ Output : WELCOME-2-WORLD
>
> From,
> Vino.B

Some like this:

substr($text , 0, 7) // --> text[ 0 .. 7 ]
substr($text, 7, 1)  // --> text[ 7 .. 7+1 ]
substr($text, 8, 5)  // --> text[ 8 .. 8+5 ]

$hg = a . b . c      // --> string hg = a ~ b ~ c;

strtoupper( s )      // --> s.toUpper

print_r($hg)         // --> writeln( hg )

And import names:
import std.uni : toUpper;
import std.stdio : writeln;

Help:
https://dlang.org/phobos/std_uni.html
https://dlang.org/phobos/std_stdio.html
https://dlang.org/spec/arrays.html#strings

On 11/9/20 9:53 AM, k2aj wrote:

> string text = "welcome2worldinfo";
> string hg = toUpper(text[0..7] ~ "-" ~ text[7..8] ~ "-" ~ text[8..13]);

If those concatenations with the ~ operators prove to be costly at runtime, the following range expression may be faster because it does not allocate any memory:

import std.string;
import std.range;
import std.algorithm;
import std.stdio;

void main() {

  string text = "welcome2worldinfo";
  auto hg = chain(text[0..7], only('-'), text[7..8], only('-'), text[8..13]).map!toUpper;
  writeln(hg);
}

Ali

On Monday, 9 November 2020 at 18:55:44 UTC, Ali Çehreli wrote:
> On 11/9/20 9:53 AM, k2aj wrote:
>
> > string text = "welcome2worldinfo";
> > string hg = toUpper(text[0..7] ~ "-" ~ text[7..8] ~ "-" ~
> text[8..13]);
>
> If those concatenations with the ~ operators prove to be costly at runtime, the following range expression may be faster because it does not allocate any memory:
>
> import std.string;
> import std.range;
> import std.algorithm;
> import std.stdio;
>
> void main() {
>
>   string text = "welcome2worldinfo";
>   auto hg = chain(text[0..7], only('-'), text[7..8], only('-'), text[8..13]).map!toUpper;
>   writeln(hg);
> }
>
> Ali

Hi Both,

  Thank you very much, your solution resolved our issue.

On Monday, 9 November 2020 at 18:55:44 UTC, Ali Çehreli wrote:
> On 11/9/20 9:53 AM, k2aj wrote:
>
> > string text = "welcome2worldinfo";
> > string hg = toUpper(text[0..7] ~ "-" ~ text[7..8] ~ "-" ~
> text[8..13]);
>
> If those concatenations with the ~ operators prove to be costly at runtime, the following range expression may be faster because it does not allocate any memory:
>
> import std.string;
> import std.range;
> import std.algorithm;
> import std.stdio;
>
> void main() {
>
>   string text = "welcome2worldinfo";
>   auto hg = chain(text[0..7], only('-'), text[7..8], only('-'), text[8..13]).map!toUpper;
>   writeln(hg);
> }
>
> Ali

I am responding to this just for my personal records. I wish we could've a "add to favorites" option here.