NAME

String::Wildcard::Bash - Bash wildcard string routines

VERSION

This document describes version 0.043 of String::Wildcard::Bash (from Perl distribution String-Wildcard-Bash), released on 2019-08-30.

SYNOPSIS

    use String::Wildcard::Bash qw(
        $RE_WILDCARD_BASH
        contains_wildcard
        convert_wildcard_to_sql
        convert_wildcard_to_re
    );

    say 1 if contains_wildcard(""));      # -> 0
    say 1 if contains_wildcard("ab*"));   # -> 1
    say 1 if contains_wildcard("ab\\*")); # -> 0

    say convert_wildcard_to_sql("foo*");  # -> "foo%"

    say convert_wildcard_to_re("foo*");   # -> "foo.*"

DESCRIPTION

VARIABLES

$RE_WILDCARD_BASH

FUNCTIONS

contains_wildcard

Usage:

 $bool = contains_wildcard($wildcard_str)

Return true if $str contains wildcard pattern. Wildcard patterns include joker such as * (meaning zero or more of any characters) and ? (exactly one of any character), character class [...], and brace {...,} (brace expansion). A pattern can be escaped using a bacslash so it becomes literal, e.g. foo\* does not contain wildcard because it's foo followed by a literal asterisk *.

Aside from the abovementioned wildcard patterns, bash does other types of expansions/substitutions too, but these are not considered wildcard. These include tilde expansion (e.g. ~ becomes /home/alice), parameter and variable expansion (e.g. $0 and $HOME), arithmetic expression (e.g. $[1+2]), or history (!).

Although this module has 'Bash' in its name, this set of wildcards should be applicable to other Unix shells. Haven't checked completely though.

For more specific needs, e.g. you want to check if a string just contains joker and not other types of wildcard patterns, use "$RE_WILDCARD_BASH" directly.

convert_wildcard_to_sql

Usage:

 $sql_str = convert_wildcard_to_sql($wildcard_str);

Convert bash wildcard to SQL pattern. This includes:

  • converting unescaped * to %

  • converting unescaped ? to _

  • escaping unescaped %

  • escaping unescaped _

Unsupported constructs will cause the function to die.

convert_wildcard_to_re

Usage:

 $re_str = convert_wildcard_to_re([ \%opts, ] $wildcard_str);

Convert bash wildcard to regular expression string.

Known options:

  • brace

    Bool. Default is true. Whether to expand braces or not. If set to false, will simply treat brace as literals.

    Examples:

     convert_wildcard_to_re(            "{a,b}"); # => "(?:a|b)"
     convert_wildcard_to_re({brace=>0}, "{a,b}"); # => "\\{a\\,b\\}"
  • dotglob

    Bool. Default is false. Whether joker * (asterisk) will match a dot file. The default behavior follows bash; that is, dot file must be matched explicitly with .*.

    This setting is similar to shell behavior (shopt) setting dotglob.

    Examples:

     convert_wildcard_to_re({}          , '*a*'); # => "[^.].*a.*"
     convert_wildcard_to_re({dotglob=>1}, '*a*'); # => ".*a.*"

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/String-Wildcard-Bash.

SOURCE

Source repository is at https://github.com/perlancar/perl-String-Wildcard-Bash.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=String-Wildcard-Bash

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.

SEE ALSO

Regexp::Wildcards can also convert a string with wildcard pattern to equivalent regexp pattern, like "convert_wildcard_to_re". Can handle Unix wildcards as well as SQL and DOS/Win32. As of this writing (v1.05), it does not handle character class ([...]) and interprets brace expansion differently than bash. String::Wildcard::Bash's convert_wildcard_to_re follows bash behavior more closely and also provides more options.

Other String::Wildcard::* modules.

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019, 2015, 2014 by 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.