From: Logan Capaldo <logancapaldo@...>
Date: 2006-07-06T02:45:21+09:00
Subject: Re: Find Position of text


On Jul 5, 2006, at 1:34 PM, j3n7il jones wrote:

> Im trying to recreate a function I had in Delphi for ruby, but cannot
> figure out how to search for a string withn a string
>
> Here is the Delphi code
>
> function ReplaceString(str, value, replacer: String): String;
> var
>   aPos: Integer;
>   rslt: String;
> begin
>   aPos := Pos(value, str);
>   rslt := '';
>   result := str;//in case there is nothing to replace, return orig
> string
>   while (aPos <> 0) do begin
>     rslt := Copy(str, 1, aPos - 1) + replacer;
>     rslt := rslt + Copy(str, aPos + Length(value), Length(str));
>     str := rslt;
>     aPos := Pos(value, str);
>     result := rslt;
>   end;
> end;
>
> As you can see after begin, it calls a pascal function called "pos"
>
> which just looks for value(a string) within str (another string) and
> returns a number, the position of value within str.
>
> Possible in ruby?
>
> --  
> Posted via http://www.ruby-forum.com/.
>

ri String#index

Of course ruby already knows how to do this function you are trying  
to write.

def ReplaceString(str, value, replacement)
     copy_of_str = str.dup
     copy_of_str[value] = replacement
     copy_of_str
end