From: Joel VanderWerf <vjoel@...>
Date: 2006-07-06T02:47:24+09:00
Subject: Re: Find Position of text

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?
> 

[~] irb
irb(main):001:0> s = "Possible in ruby?"
=> "Possible in ruby?"
irb(main):002:0> s.index "in"
=> 9
irb(main):003:0> s[/in/] = "and easy in"
=> "and easy in"
irb(main):004:0> s
=> "Possible and easy in ruby?"
irb(main):005:0> s[/\?/] = "!"
=> "!"
irb(main):006:0> s
=> "Possible and easy in ruby!"

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407