NAME
    Acme::CPANModules::GrepVariants - Grep-like CLI utilities available on
    CPAN

VERSION
    This document describes version 0.007 of Acme::CPANModules::GrepVariants
    (from Perl distribution Acme-CPANModules-GrepVariants), released on
    2021-10-07.

DESCRIPTION
    1. Reimplementations

    grep from PerlPowerTools simply tries to reimplement grep in Perl, as
    part of the project to reimplement many Unix utilities in Perl. It has
    few practical uses; mainly educational. The portability advantage of
    Perl is probably minor as grep and many Unix utilities are now available
    on other platforms including Windows.

    2a. Improvements in recursive searching against files

    ack. Created in 2005 by Andy Lester, ack is the granddaddy of grep-like
    programs that try to improve the experience of using grep to search for
    text in source code. ack skips VCS directories like ".git" or ".svn",
    and understands file types so it doesn't look into giant ".mp4"s and
    other binaries by default. ack has spurred the development of its
    improvements (mostly in speed aspect) like The Silver Searcher ("ag")
    (implemented in C) or "ripgrep" (implemented in Rust). "git" also now
    includes a "git-grep" utility (implemented in C). ack has a website:
    <https://beyondgrep.com>. See also <https://betterthanack.com>.

    gre from App::Gre is a "grep clone using Perl regexp's with better file
    filtering, defaults, speed, and presentation". It seems to focus on
    providing many options to filter files (from including/excluding by file
    extension, by matching against filename, by first line, by maximum
    directory depth, and so on). It also offers some alternative output
    styles.

    2b. Improvements in specifying multiple patterns

    Normally with the regular grep, to search for all 'foo' and 'bar', you
    either have to do something like:

     % grep --color=always foo FILES | grep bar

    or:

     % grep -P 'foo.*bar|bar.*foo' FILES

    both of which get unwieldy if the number of patterns get higher. Or you
    can use look-ahead:

     % grep -P '(?=.*foo)(?=.*bar)' FILES

    but this does not capture (thus highlight) the patterns.

    Note that searching for multiple patterns in particular order
    ('foo.*bar'), or searching for aternates from multiple patterns
    ('foo|bar') is no problem in grep.

    Some tools have been written to make it easier to specify multiple
    patterns.

    abgrep from App::abgrep.

    greple from App::Greple. greple also has a few other tricks up its
    sleeve, like configuration file to define complex regexes, matching
    across lines, and Japanese text support.

    grep-terms from App::GrepUtils all try to make searching for multiple
    patterns in grep easier.

    3. Variants: alternate ways of specifying regex

    Instead of specifying a pattern, with App::rpgrep you can specify a
    pattern name in a Regexp::Pattern::* module instead.

    4a. Variants: alternate source: repository (version control system)
    content and history

    For git, the abovementioned "git-grep" can search for files in the work
    tree as well as commit content. For Mercurial, "hg grep" accomplishes
    the same. Alternatively you can dump the history then use the standard
    "grep" to go through it.

    4b. Variants: alternate source: Perl source code

    pmgrep from App::pmgrep lets you grep over locally installed Perl
    modules. It's basically a shortcut for something like this:

     % pmlist -Rx | xargs grep PAT
     % grep PAT C<pmlist -Rx>

    cpangrep from App::cpangrep is a CLI for web service
    <https://cpan.grep.me>, which is no longer operating. To grep from files
    on CPAN, use <https://metacpan.org>.

    grepl from App::Grepl uses PPI to let you grep over Perl *documents*; it
    allows you to do things like: search only in Perl code comments or
    inside string literals.

    podgrep from pmtools greps from POD sections of Perl source.

    4b. Variants: alternate source: CSV

    csvgrep from csvgrep

    csv-grep from App::CSVUtils allows you to apply Perl code against rows
    of CSV.

    4c. Variants: alternate source: word lists

    wordlist from App::wordlist greps words from wordlist modules (modules
    that contains word lists, see WordList).

    4d. Variants: other alternate sources

    grep-from-bash-history from App::BashHistoryUtils.

    grep-from-iod from App::IODUtils.

    grep-from-ini from App::INIUtils.

    grep-from-coin from App::CryptoCurrencyUtils.

    grep-from-exchange from App::CryptoCurrencyUtils.

    jgrep from App::JsonLogUtils

    pdfgrep (alias: grep-from-pdf) from App::PDFUtils searches against text
    in PDF files (it's a wrapper for "pdftotext" utility and grep).

    ptargrep from Archive::Tar searches against table of contents of tar
    files.

    5a. Variants: searching URLs

    App::grep::url greps URLs from lines of input. You don't have to
    manually specify regex that matches URLs yourself; you can just add
    additional criteria for the URLs, e.g. whether the host part must
    contain some text, or whether a certain query parameter must match some
    pattern.

    5b. Variants: searching dates

    grep-date from App::grep::date greps for dates in lines of text.

    dategrep from App::dategrep prints lines matching a date range.

ACME::MODULES ENTRIES
    *   PerlPowerTools

    *   ack

    *   App::Gre

    *   App::abgrep

    *   App::Greple

    *   App::GrepUtils

    *   App::rpgrep

    *   Regexp::Pattern

    *   App::pmgrep

    *   App::cpangrep

    *   App::Grepl

    *   PPI

    *   pmtools

    *   csvgrep

    *   App::CSVUtils

    *   App::wordlist

    *   App::BashHistoryUtils

    *   App::IODUtils

    *   App::INIUtils

    *   App::CryptoCurrencyUtils

    *   App::JsonLogUtils

    *   App::PDFUtils

    *   Archive::Tar

    *   App::grep::url

FAQ
  What is an Acme::CPANModules::* module?
    An Acme::CPANModules::* module, like this module, contains just a list
    of module names that share a common characteristics. It is a way to
    categorize modules and document CPAN. See Acme::CPANModules for more
    details.

  What are ways to use this Acme::CPANModules module?
    Aside from reading this Acme::CPANModules module's POD documentation,
    you can install all the listed modules (entries) using cpanm-cpanmodules
    script (from App::cpanm::cpanmodules distribution):

     % cpanm-cpanmodules -n GrepVariants

    Alternatively you can use the cpanmodules CLI (from App::cpanmodules
    distribution):

        % cpanmodules ls-entries GrepVariants | cpanm -n

    or Acme::CM::Get:

        % perl -MAcme::CM::Get=GrepVariants -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

    or directly:

        % perl -MAcme::CPANModules::GrepVariants -E'say $_->{module} for @{ $Acme::CPANModules::GrepVariants::LIST->{entries} }' | cpanm -n

    This Acme::CPANModules module also helps lcpan produce a more meaningful
    result for "lcpan related-mods" command when it comes to finding related
    modules for the modules listed in this Acme::CPANModules module. See
    App::lcpan::Cmd::related_mods for more details on how "related modules"
    are found.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Acme-CPANModules-GrepVariants>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Acme-CPANModules-GrepVariants>.

SEE ALSO
    Acme::CPANModules - about the Acme::CPANModules namespace

    cpanmodules - CLI tool to let you browse/view the lists

    Acme::CPANModules::GoodInterfaces

AUTHOR
    perlancar <perlancar@cpan.org>

CONTRIBUTING
    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.

COPYRIGHT AND LICENSE
    This software is copyright (c) 2021, 2020 by perlancar
    <perlancar@cpan.org>.

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

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Acme-CPANModules-Grep
    Variants>

    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.

