[regexp] How to access the matched result by index?

[metfan]

Hi, gurus,

We know that while using regexp to match something, the matched
result will be set in $1, $2, $3, $4..... but, is there a way to
access the result by an index? for example I've a variable called
$index, if has an integer of 10, so the result I need is $10, so
is there any array for me to use like $MatchedResult[$index]?
thanks so much.

 

[gnari]

Hi, gurus,

We know that while using regexp to match something, the matched
result will be set in $1, $2, $3, $4..... but, is there a way to
access the result by an index? for example I've a variable called
$index, if has an integer of 10, so the result I need is $10, so
is there any array for me to use like $MatchedResult[$index]?
thanks so much.

apart from the $1,$2... thing,

there is the very practical
($a,$b,$c)=/(.)(..)(..)/;

so you can do
@MatchedResult=/$regexp/;
print $MatchedResult[$index];

or just
print (/$regexp/)[$index];

gnari

 

[Ben Morrow]

Hi, gurus,

We know that while using regexp to match something, the matched
result will be set in $1, $2, $3, $4..... but, is there a way to
access the result by an index? for example I've a variable called
$index, if has an integer of 10, so the result I need is $10, so
is there any array for me to use like $MatchedResult[$index]?
thanks so much.

See the example in perldoc perlvar under @-.

Ben

 

[dw]

Hi, gurus,

We know that while using regexp to match something, the matched
result will be set in $1, $2, $3, $4..... but, is there a way to
access the result by an index? for example I've a variable called
$index, if has an integer of 10, so the result I need is $10, so
is there any array for me to use like $MatchedResult[$index]?
thanks so much.

How about using:

$_ = "abcdefghijklmnopqrstuvwxyz";

@MatchedResult = /(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)(\w)/;

for ($count=0; $count<@MatchedResult; $count++) {
print "\$MatchedResult[$count]: $MatchedResult[$count]\n";
}

 

[Bob Walton]

....


print (/$regexp/)[$index];

Um, that's a syntax error. Maybe you mean:

print +(/$regexp/)[$index];

 

[Anno Siegel]

Hi, gurus,

We know that while using regexp to match something, the matched
result will be set in $1, $2, $3, $4..... but, is there a way to
access the result by an index? for example I've a variable called
$index, if has an integer of 10, so the result I need is $10, so
is there any array for me to use like $MatchedResult[$index]?
thanks so much.

If you know the number of possible matches, the simplest way is

( $1, $2, $3, $4, $5)[ $i];

The simplest isn't necessarily the best way.

Anno

 

[gnari]

print (/$regexp/)[$index];

Um, that's a syntax error. Maybe you mean:

print +(/$regexp/)[$index];

actually, i meant print ((/$regexp/)[$index]);

gnari