On Mon, 4 Jun 2001, Nathaniel Mallet <[EMAIL PROTECTED]> wrote,
> Date: Mon, 4 Jun 2001 21:06:43 -0400
> From: Nathaniel Mallet <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Substring retrieval
>
> Hi,
>
> I'm trying to retrieve a substring from a string, but I'm not sure
> exactly where and how big that substring is. The substring is
> delimited by a start and end special character. It was suggested to
> me to write two regular expression, one that would match everything
> up to and including the start special character, and one to match
> everything following and including the end special character, and
> replacing the matches with nothing.
>
> I thought finding the location of the start and end special
> characters, then calling substr().
>
> And so I have to questions:
> 1 - How would I find the index for a particular character in a string?
Using index() function. Now, doesn't it suprise you?
perldoc -f index
> 2 - What's the best method, everything considered (simplicity,
> performance, etc).
- how many times does the substring you want to retrieve occur
in the string? Exactly once? Can be more?
- Are the start and end special characters just the same?
Regular expression is the common way to solve this, but you could also
use split() or combination of substr/index.
__END__
s.a.n
--
Hasanuddin Tamir: [EMAIL PROTECTED] - Trabas: www.trabas.com
