Re: can a regex pattern match return the starting position of the match?

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From: Conor 
To: gai...@visioninfosoft.com
Cc: perl-win32-users@listserv.activestate.com
Sent: Thursday, April 14, 2011 2:08 PM
Subject: Re: can a regex pattern match return the starting position of the 
match?


Greg-

This question was answered on Stack 
Overflow: http://stackoverflow.com/questions/87380/how-can-i-find-the-location-of-a-regex-match-in-perl

brian d foy's answer seems to be the best:

The built-in variables @- and @+ hold the start and end positions, 
respectively, of the last successful match. $-[0] and $+[0] correspond to 
entire pattern, while $-[N] and $+[N] correspond to the $N ($1, $2, etc.) 
submatches.

-Conor


On Thu, Apr 14, 2011 at 10:38 AM, Greg Aiken  wrote:

given how smart perl is, I was thinking there must be a
function within perl whereby if one does a pattern match against a scaler, that
in addition to having regex being able to return such built in vars as: $`
(what preceeds the match), $’ (what follows the match), $1, etc…  
> 
>is there a built in var that returns the position within the
scalar where the match occurred?
> 
>of course, if not, one may always evaluate length($`).
> 
>I was just curious
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Re: can a regex pattern match return the starting position of the match?

[Conor]

Greg-

This question was answered on Stack Overflow:
http://stackoverflow.com/questions/87380/how-can-i-find-the-location-of-a-regex-match-in-perl

brian
d foy's answer seems to be the best:

The built-in variables @- and @+ hold the start and end positions,
respectively, of the last successful match. $-[0] and $+[0] correspond to
entire pattern, while $-[N] and $+[N] correspond to the $N ($1, $2, etc.)
submatches.

-Conor

On Thu, Apr 14, 2011 at 10:38 AM, Greg Aiken wrote:

>  given how smart perl is, I was thinking there must be a function within
> perl whereby if one does a pattern match against a scaler, that in addition
> to having regex being able to return such built in vars as: $` (what
> preceeds the match), $’ (what follows the match), $1, etc…
>
>
>
> is there a built in var that returns the position within the scalar where
> the match occurred?
>
>
>
> of course, if not, one may always evaluate length($`).
>
>
>
> I was just curious
>
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> Perl-Win32-Users mailing list
> Perl-Win32-Users@listserv.ActiveState.com
> To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
>
>
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