But if you have to use a regex, I suggest using the /x modifier to make it
easier to read an maintain the regex:
#!/usr/bin/perl
use strict;
use warnings;
for my $s (qw/binutils-2.23.52.0.1-12.el7.x86_64
compat-libcap1-1.10-3.el7.x86_64 compat-libstdc++-33-3.2.3-71.el7.i686/) {
my ($name, $version, $build) = $s =~ m{
^ (.*) # name
- (.*) # version
- ([0-9]+) # build
[.] [^.]+ # os
[.] [^.]+ \z # architecture
}x;
print "n $name v $version b $build\n";
}
On Fri, Jul 27, 2018 at 9:14 AM Chas. Owens <chas.ow...@gmail.com> wrote:
> I don't think a regex is the simplest and most maintainable way to get
> this information. I think it is probably better to take advantage of the
> structure of the string to discard and find information:
>
> #!/usr/bin/perl
>
> use strict;
> use warnings;
>
> for my $s (qw/binutils-2.23.52.0.1-12.el7.x86_64
> compat-libcap1-1.10-3.el7.x86_64 compat-libstdc++-33-3.2.3-71.el7.i686/) {
> my @dots = split /\,/, $s;
> pop @dots; #get rid of architecture
> pop @dots; #get rid of os
> my $name_and_version = join "", @dots;
> my @dashes = split /-/, $s;
> my $build = pop @dashes;
> my $version = pop @dashes;
> my $name = join "-", @dashes;
> print "n $name v $version b $build\n";
> }
>
>
>
> On Fri, Jul 27, 2018 at 8:57 AM Asad <asad.hasan2...@gmail.com> wrote:
>
>> Hi All ,
>>
>> I want to get a regex to actually get the rpm name and version
>> for comparison :
>>
>>
>> binutils-2.23.52.0.1-12.el7.x86_64",
>> compat-libcap1-1.10-3.el7.x86_64"
>> compat-libstdc++-33-3.2.3-71.el7.i686
>>
>> (^[a-zA-Z0-9\-]*)\-\d'
>>
>> First part of the regular expression is ^[a-zA-Z0-9\-]
>>
>> which means search for anything that begins with a letter
>>
>> (lower or upper) or a number up until you reach an
>>
>> hyphen sign (‘-‘).
>>
>> but it fails to match
>>
>> compat-libstdc++-33-3.2.3-71.el7.i686
>>
>> Please let me know what regex should i use to extract all 3
>>
>> rpms.
>>
>> Also let me know if there are web tools to build regex
>>
>> Good websites for regex tutorials.
>>
>>
>>
>>
>> Thanks,
>>
>>
>>
>>
>>
>> --
>> Asad Hasan
>> +91 9582111698 <+91%2095821%2011698>
>>
>
