RE: [FWP] Is this fun? What's going on?

[Larry Rosler <lr@hpl.hp.com>]

> From: Prakash Kailasa [mailto:PrakashK@bigfoot.com]
> Sent: Friday, August 06, 1999 09:26
> To: Bill Jones
> Cc: Fun With Perl
> Subject: Re: [FWP] Is this fun? What's going on?
> 
> Bill Jones wrote:
> > 
> > [..deleted..]
> >
> > On a related note -
> > 
> > s{(\d+\.\d+)}  {<A HREF="$1">$1</A>}g;
> > 
> > What can I change to also match an optional
> > third or fourth  (  #.#.#  or #.#.#.# ) section number???
> 
> 	s{(\d+(\.\d+)+)} {<A HREF="$1">$1</A>};
> will match any number of #.#... sequences
> 
> If you want to limit that to 4 levels only,
> 	s{(\d+(\.\d+){2,4})} {<A HREF="$1">$1</A>};

                    1,3

And slightly more stylish to make the inner parens non-capturing, as
others have shown:

> 	s{(\d+(?:\.\d+){1,3})} {<A HREF="$1">$1</A>};

-- 
Larry Rosler
Hewlett-Packard Laboratories
http://www.hpl.hp.com/personal/Larry_Rosler/
lr@hpl.hp.com 

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