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From: Yakov on 29 Jan 2007 10:17
I have submatch index in a variable, $SUB=5. How do I write submatch
reference $5 using $SUB ?
Is ${$SUB} ok ?

2. Is there array of subpatterns ($1..$<N>) so I can take it's size ?

Yakov

From: Paul Lalli on 29 Jan 2007 10:32
On Jan 29, 10:17 am, "Yakov" <iler...(a)gmail.com> wrote:
> I have submatch index in a variable, $SUB=5. How do I write submatch
> reference $5 using $SUB ?
> Is ${$SUB} ok ?

What happened when you tried it?

> 2. Is there array of subpatterns ($1..$<N>) so I can take it's size ?

Just evaluate the pattern match in list context.

my @matches = $x =~ /(foo).*(bar).*(baz)/;
print "Found " . @matches . " matches\n";

If that's not what you meant, please post a short-but-complete program
that demonstrates what you're trying to do and how you're having
difficulty.

Have you read the Posting Guidelines that are posted here twice a
week?

Paul Lalli

From: Mumia W. (NOSPAM) on 29 Jan 2007 20:29
On 01/29/2007 09:17 AM, Yakov wrote:
> I have submatch index in a variable, $SUB=5. How do I write submatch
> reference $5 using $SUB ?
> Is ${$SUB} ok ?
>

my $SUB = 5;
my @matches = m/.../;
print $matches[$SUB];

> 2. Is there array of subpatterns ($1..$<N>) so I can take it's size ?
>
> Yakov
>

Yes, after you have assigned the output from the match operator to an array.

my @matches = m/.../;
print scalar(@matches);

Read the documentation: Start->Run->"perldoc perlrequick"


--
Windows Vista and your freedom in conflict:
http://www.badvista.org/

From: anno4000 on 30 Jan 2007 11:20
Mumia W. (NOSPAM) <paduille.4060.mumia.w+nospam(a)earthlink.net> wrote in comp.lang.perl.misc:
> On 01/29/2007 09:17 AM, Yakov wrote:
> > I have submatch index in a variable, $SUB=5. How do I write submatch
> > reference $5 using $SUB ?
> > Is ${$SUB} ok ?
> >
>
> my $SUB = 5;
> my @matches = m/.../;
> print $matches[$SUB];
>
> > 2. Is there array of subpatterns ($1..$<N>) so I can take it's size ?
> >
> > Yakov
> >
>
> Yes, after you have assigned the output from the match operator to an array.

That's not always necessary. The system arrays @+ and @- also hold
(string pointers to) the submatches. See perlvar about them.

> my @matches = m/.../;
> print scalar(@matches);

....or

m/.../ and print @- - 1, "\n";

The array @- longer by one than @matches would be because $-[0]
holds the beginning of the entire match (captured or not). Hence
the subtraction of one.

On the other hand, with a //g modifier your list assignment would
collect all the captures in the global match while @- reflects only
the state of the last match.

Anno
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