A variation using splits and maps.
$ perl -MData::Dumper -Mstrict -Mwarnings -E '
> my $str =
> q{1. ...... AB_CD 1.1 ...... EF_GH 1.2 .... IJ_KL_MN 2. .........
+... OPQR};
> my $raChapters = [
> map { { chapter => $_->[ 0 ], name => $_->[ 1 ] } }
> map { [ split m{[. ]{2,}} ] }
> split m{ (?=\d)}, $str
> ];
> print Data::Dumper->Dumpxs( [ $raChapters ], [ qw{ raChapters } ] );
+'
$raChapters = [
{
'name' => 'AB_CD',
'chapter' => '1'
},
{
'name' => 'EF_GH',
'chapter' => '1.1'
},
{
'name' => 'IJ_KL_MN',
'chapter' => '1.2'
},
{
'name' => 'OPQR',
'chapter' => '2'
}
];
$
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