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Re: how to get numbers only from n numbers or more digit numbers?

by AnomalousMonk (Abbot)
on Jun 13, 2013 at 16:50 UTC ( #1038799=note: print w/ replies, xml ) Need Help??


in reply to how to get numbers only from n numbers or more digit numbers?

I'm confused about what you really need, and this is quite possibly overkill. (Regex  \K operator only available with Perl versions 5.10+.)

>perl -wMstrict -le "use Test::More 'no_plan'; use Test::NoWarnings; ;; my @vectors = ( [ 'chapters 01,02,03,04', qw(01 02 03 04), ], [ 'chapters 1 , 2 , 3 , 4 , 5', qw(1 2 3 4 5), ], [ 'in chapter 01', qw(01), ], [ 'chapter 101', qw(101), ], [ 'chapters 99, 100 ,101 also', qw(99 100 101), ], [ 'chapters 3, 4, 5 and chapter 9', qw(3 4 5 9), ], [ 'read chapters 3, 4 and chapter 9', qw(3 4 9), ], 'pay particular attention to the next variation', [ 'chapters 3, 4, 5 and 9', qw(3 4 5), ], 'no chapter numbers should be extracted from any of these', [ 'chapter' ], [ 'chapters' ], [ 'chapter ii' ], [ '01,02' ], ); ;; VECTOR: for my $ar_vector (@vectors) { unless (ref $ar_vector) { note $ar_vector; next VECTOR; } my ($s, @expected) = @$ar_vector; my @n = $s =~ m{ (?: \G (?<! \A) \s* , \s* | chapters? \s+) \K \d+ }xmsg; is_deeply \@n, \@expected, qq{'$s' -> (@expected)}; } " ok 1 - 'chapters 01,02,03,04' -> (01 02 03 04) ok 2 - 'chapters 1 , 2 , 3 , 4 , 5' -> (1 2 3 4 5) ok 3 - 'in chapter 01' -> (01) ok 4 - 'chapter 101' -> (101) ok 5 - 'chapters 99, 100 ,101 also' -> (99 100 101) ok 6 - 'chapters 3, 4, 5 and chapter 9' -> (3 4 5 9) ok 7 - 'read chapters 3, 4 and chapter 9' -> (3 4 9) # pay particular attention to the next variation ok 8 - 'chapters 3, 4, 5 and 9' -> (3 4 5) # no chapter numbers should be extracted from any of these ok 9 - 'chapter' -> () ok 10 - 'chapters' -> () ok 11 - 'chapter ii' -> () ok 12 - '01,02' -> () ok 13 - no warnings 1..13


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