Sah::Schema::perl::modname - Perl module name, e.g. Foo::Bar


This document describes version 0.040 of Sah::Schema::perl::modname (from Perl distribution Sah-Schemas-Perl), released on 2021-10-05.


To check data against this schema (requires Data::Sah):

 use Data::Sah qw(gen_validator);
 my $validator = gen_validator("perl::modname*");
 say $validator->($data) ? "valid" : "INVALID!";

 # Data::Sah can also create validator that returns nice error message string
 # and/or coerced value. Data::Sah can even create validator that targets other
 # language, like JavaScript. All from the same schema. See its documentation
 # for more details.

To validate function parameters against this schema (requires Params::Sah):

 use Params::Sah qw(gen_validator);

 sub myfunc {
     my @args = @_;
     state $validator = gen_validator("perl::modname*");

To specify schema in Rinci function metadata and use the metadata with Perinci::CmdLine to create a CLI:

 # in lib/
 package MyApp;
 our %SPEC;
 $SPEC{myfunc} = {
     v => 1.1,
     summary => 'Routine to do blah ...',
     args => {
         arg1 => {
             summary => 'The blah blah argument',
             schema => ['perl::modname*'],
 sub myfunc {
     my %args = @_;

 # in
 package main;
 use Perinci::CmdLine::Any;

 # in command-line
 % ./ --help
 myapp - Routine to do blah ...

 % ./ --version

 % ./ --arg1 ...

Sample data:

 ""  # INVALID

 "Foo::Bar"  # valid

 "Foo-Bar"  # valid, becomes "Foo::Bar"

 "Foo/Bar"  # valid, becomes "Foo::Bar"

 "Foo/"  # valid, becomes "Foo::Bar"

 "Foo.Bar"  # valid, becomes "Foo::Bar"

 "Foo|Bar"  # INVALID


This is a schema you can use when you want to accept a Perl module name. It offers basic checking of syntax as well as a couple of conveniences. First, it offers completion from list of locally installed Perl modules. Second, it contains coercion rule so you can also input Foo-Bar, Foo/Bar, Foo/ or even 'Foo.Bar' and it will be normalized into Foo::Bar.

To see this schema in action on the CLI, you can try e.g. the pmless script from App::PMUtils and activate its tab completion (see its manpage for more details). Then on the CLI try typing:

 % pmless M/<tab>
 % pmless dzp/<tab>
 % pmless Module/List/Wildcard
 % pmless Module::List::Wildcard

Note that this schema does not check that the Perl module exists or is installed locally. To check that, use the perl::modname::installed schema. And there's also a perl::modname::not_installed schema.


Please visit the project's homepage at


Source repository is at


perlancar <>


To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

 % prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla plugin and/or Pod::Weaver::Plugin. Any additional steps required beyond that are considered a bug and can be reported to me.


This software is copyright (c) 2021, 2020, 2019, 2018, 2017, 2016 by perlancar <>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.


Please report any bugs or feature requests on the bugtracker website

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.