RegEx bump version number

ady has asked for the wisdom of the Perl Monks concerning the following question:

I want a rexex s///e to bump up the build number, eg. from 0.8.34.0 to 0.8.35.0. I tried the following, but was stalled in the regex...

#!/usr/bin/perl -w
use strict;

my $version = '0.8.34.0';

# This works as expected
$version =~ /(\d+\.\d+\.)(\d+)(\.\d+)/;
$version = $1 . ($2 + 1) . $3;  
print "$version\n";

# but this won't compile, --- why?
#$version =~ s/(\d+\.\d+\.)(\d+)(\.\d+)/{$1}$2+1{$3}/e;
print $version;
[download]

Update
Ok OK!! Folks, flowering TMTOWTDItis .. :-D Thanks! -- allan

#!/usr/bin/perl -w
use strict;

my $version = '0.8.34.0';

$version =~ /(\d+\.\d+\.)(\d+)(\.\d+)/;
$version = $1 . ($2 + 1) . $3;
print "$version\n";

$version =~ s/(\d+\.\d+\.)(\d+)(\.\d+)/$1.($2+1).$3/e;
print "$version\n";

$version = do { my $v = [ split /\./, $version ]; $v->[2]++; join '.',
+ @$v };
print "$version\n";

$version =~ s/(\d+)(?=\.\d+\z)/$1 + 1/e;
print "$version\n";
[download]

Beast regards -- allan

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