On 2010.03.12 00:33, John W. Krahn wrote:
> raphael() wrote:
>> #!/usr/bin/env perl
>>
>> use strict;
>> use warnings;
>>
>> my @array = qw (
>> http://abc.com/files/randomthings/A/1.html
>> http://abc.com/files/randomthings/A/2.html
>> );
>>
>> for ( @array ) {
>>
>> # This works
>> # s!/A/\d+.html$!!; $url = $_;
>
> Not quite, that should be:
>
> s!/A/\d+\.html$!!; $url = $_;
>
> Unless the . character is escaped it will match *any* character.
>
>
>> # Doesn't work ~ gives "1"
>> ( my $url ) = ( $_ ) =~ s!/A/\d+.html$!!;
>> print "$url" . "\n";
>>
>> }
>>
>> __END__
>>
>> I want to remove the '/A/1.html'
>
> That means that you want to modify @array? Do you really need to?
>
>
>> and assign the remaining value i.e. link to
>> "$url"
>> But all I get is "1" as value of "$url" which I think is return value
>> that
>> substitution worked.
>>
>> How can I remove '/A/1.html' and assign remaining "$_" to "$url"?
>
> If you just want to assign everything before '/A/1.html' to $url then:
>
> ( my $url ) = m!(.*)/A/\d+\.html$!;
>
> If you really need to modify @array then go with your commented out code
> at the top of the loop.
I applaud the OP for his question ;)
After I changed some of the sample by removing the use of $_, there were
certain circumstances where having the parens were necessary, and other
times not.
Am I correct in thinking that this:
$url = $file =~ m{ (.*) /A/\d+.html }x;
...assigns '1' to $url because =~ binds tighter and assigns a 'true'
value to $url, whereas:
( $url ) = $file =~ m{ (.*) /A/\d+.html }x;
...$url here is evaluated first, and assigned the actual string
afterwards? iow, is it simply an arithmetic thing, that can also be seen
as this:?
( $url ) = ( $file =~ m! (.*) /A/\d+.html !x );
D'oh! I just answered my own question. Learn something new everyday,
even though it's a principle that I've known for years, but just didn't
apply it...
( my $this ) = ( ( $url ) = ( $file =~ m! (.*) /A/\d+.html !x ) );
print "$url :: $this\n";
Steve
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