G'day All,

I was absolutely certain that I'd seen a regex for checking module names somewhere in https://perldoc.perl.org/perl but, after checking through many documentation pages, I cannot locate it.

I came up with:

qr{^[A-Za-z_][A-Za-z0-9_]*(?:::[A-Za-z0-9_]+)*$}

[download]

I'm aware that only has the "::" separator; not the (ancient) "'" separator.

I copied a number of module names from perlmodlib — which I hope covers all cases — and tested with: 

#!/usr/bin/env perl

use strict;
use warnings;

use Test::More;

my @modules = qw{
    strict
    autodie::exception::system
    utf8
    B
    App::Prove::State::Result::Test
    CPAN::Meta::History::Meta_1_0
    Encode::KR::2022_KR
};

plan tests => 0+@modules;

my $re = qr{^[A-Za-z_][A-Za-z0-9_]*(?:::[A-Za-z0-9_]+)*$};

for my $mod (@modules) {
    is $mod =~ $re, !!1, "Testing $mod";
}

[download]

Output:

1..7
ok 1 - Testing strict
ok 2 - Testing autodie::exception::system
ok 3 - Testing utf8
ok 4 - Testing B
ok 5 - Testing App::Prove::State::Result::Test
ok 6 - Testing CPAN::Meta::History::Meta_1_0
ok 7 - Testing Encode::KR::2022_KR

[download]

If anyone knows about an official regex for this, please let me know.

If I am just imagining that I saw such a regex at some point in the past, I'll use what I have here. In that case, I'd appreciate knowing about any edge cases that I might have missed (or other improvements).

— Ken

In reply to Is there an official regex for checking module names? by kcott

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