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App::genusername - Generate random username


This document describes version 0.001 of App::genusername (from Perl distribution App-genusername), released on 2024-01-16.


See the included script genusername.




 genusername(%args) -> [$status_code, $reason, $payload, \%result_meta]

Generate random username.

This is a thin wrapper for genpw.

This function is not exported.

Arguments ('*' denotes required arguments):

  • action => str (default: "gen")

    (No description)

  • case => str (default: "default")

    Force casing.

    default means to not change case. random changes casing some letters randomly to lower-/uppercase. lower forces lower case. upper forces UPPER CASE. title forces Title case.

  • num => int (default: 1)

    (No description)

  • patterns => array[str]

    Pattern(s) to use.

    CONVERSION (%P). A pattern is string that is roughly similar to a printf pattern:


    where P is certain letter signifying a conversion. This will be replaced with some other string according to the conversion. An example is the %h conversion which will be replaced with hexdigit.

    LENGTH (%NP). A non-negative integer (N) can be specified before the conversion to signify desired length, for example, %4w will return a random word of length 4.

    MINIMUM AND MAXIMUM LENGTH (%M$NP). If two non-negative integers separated by $ is specified before the conversion, this specify desired minimum and maximum length. For example, %4$10h will be replaced with between 4 and 10 hexdigits.

    ARGUMENT AND FILTERS (%(arg)P, %(arg)(filter1)(...)P). Finally, an argument followed by zero or more filters can be specified (before the lengths) and before the conversion. For example, %(wordlist:ID::KBBI)w will be replaced by a random word from the wordlist WordList::ID::KBBI. Another example, %()(Str::uc)4$10h will be replaced by between 4-10 uppercase hexdigits, and %(arraydata:Sample::DeNiro)(Str::underscore_non_latin_alphanums)(Str::lc)(Str::ucfirst)w will be replaced with a random movie title of Robert De Niro, where symbols are replaced with underscore then the string will be converted into lowercase and the first character uppercased, e.g. Dear_america_letters_home_from_vietnam.

    Anything else will be left as-is.

    Available conversions:

     %l   Random Latin letter (A-Z, a-z)
     %d   Random digit (0-9)
     %h   Random hexdigit (0-9a-f in lowercase [default] or 0-9A-F in uppercase).
          Known arguments:
          - "u" (to use the uppercase instead of the default lowercase digits)
     %a   Random letter/digit (Alphanum) (A-Z, a-z, 0-9; combination of %l and %d)
     %s   Random ASCII symbol, e.g. "-" (dash), "_" (underscore), etc.
     %x   Random letter/digit/ASCII symbol (combination of %a and %s)
     %m   Base64 character (A-Z, a-z, 0-9, +, /)
     %b   Base58 character (A-Z, a-z, 0-9 minus IOl0)
     %B   Base56 character (A-Z, a-z, 0-9 minus IOol01)
     %%   A literal percent sign
     %w   Random word. Known arguments:
          - "stdin:" (for getting the words from stdin, the default)
          - "wordlist:NAME" (for getting the words from a L<WordList> module)
          - "arraydata:NAME" (for getting the words from an L<ArrayData> module, the
            Role::TinyCommons::Collection::PickItems::RandomPos will be applied).

    Filters are modules in the Data::Sah::Filter::perl:: namespace.

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)


Please visit the project's homepage at


Source repository is at


genpw (from App::genpw)


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, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.


This software is copyright (c) 2024 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.