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Re: Regexp substitution on variable-length ranges with embedded code?

by choroba (Archbishop)
on May 26, 2021 at 11:18 UTC ( #11133055=note: print w/replies, xml ) Need Help??


in reply to Regexp substitution on variable-length ranges with embedded code?

You can use regex to extract the data, but I'd reach for something like Set::IntSpan to handle the intervals.
#!/usr/bin/perl use warnings; use strict; use Set::IntSpan; my $data = '43:1:1; 43:1:2; 43:1:3; 43:1:4; 43:1:5; 43:1:6; 27:3:7; 27 +:3:8; 27:3:9; 65:1:4; 65:1:18'; my %result; my $out = sub { my $key = (keys %result)[0] or return; print "$key:", delete $result{$key}, ';'; }; while ($data =~ /([0-9]+:[0-9]+):([0-9]+)/g) { my ($key, $value) = ($1, $2); if (exists $result{$key}) { $result{$key}->U($value); } else { $out->(); $result{$key} = 'Set::IntSpan'->new($value); } } $out->();
Output:
43:1:1-6;27:3:7-9;65:1:4,18;

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Replies are listed 'Best First'.
Re^2: Regexp substitution on variable-length ranges with embedded code?
by Fletch (Bishop) on May 26, 2021 at 13:53 UTC

    I saw this and was going to reply with something to the effect of Set::IntSpan but I was too late and mine wouldn't have had as clever a trick with that closure coderef . . . bah.

    Also as far as the original question, IMHO most times if you're thinking about embedding code inside your regexen you're pretty well already deep into (quasi-apocryphical) JWZ-quote / xkcd 1171 territory.

    The cake is a lie.
    The cake is a lie.
    The cake is a lie.

        I always had an admiration for that cat; solely based on his Netscape exit letter. After reading that roundup I must remark: Anyone who can earnestly write, “Perl is mostly terrible, maybe Java will save us,” cannot be taken seriously.

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