NAME
    Regexp::Common::URI::RFC3986 - Regexp patterns from RFC 3986

SYNOPSIS
        use Regexp::Common::URI::RFC3986 qw /:ALL/;

        # Match a full URI
        if( $string =~ /^$URI_reference$/ )
        {
            print "Valid URI reference\n";
        }

        # Match an IPv6 literal host
        if( $string =~ /^$IP_literal$/ )
        {
            print "Valid IP literal\n";
        }

        # Use IDN helpers for Unicode hostnames
        use Regexp::Common::URI::RFC3986 qw /:IDN/;

        if( $string =~ /^$IDN_HOST$/ )
        {
            print "Valid Unicode hostname\n";
        }

VERSION
        2025102001

DESCRIPTION
    This module exports regular expressions derived from RFC 3986 (*Uniform
    Resource Identifier (URI): Generic Syntax*, January 2005), which
    supersedes RFC 2396.

    All exported variables are plain strings containing non-capturing regex
    fragments ("(?:...)"). They are designed to be interpolated into larger
    patterns and do not require "Regexp::Common" to function.

    The exported variables mirror the structure and naming of
    "Regexp::Common::URI::RFC2396" (from the "Regexp-Common" distribution),
    updated to the RFC 3986 grammar. Key improvements over RFC 2396 include:

    *   $pct_encoded replacing the old $escaped

    *   $sub_delims and $unreserved per RFC 3986 §2

    *   The full set of "path_*" productions ($path_abempty, $path_absolute,
        $path_noscheme, $path_rootless, $path_empty)

    *   $IP_literal supporting IPv6 addresses and "IPvFuture" forms

    *   $IPv6address as a faithful transcription of RFC 3986 Appendix A

    For backward compatibility, several RFC 2396 names ($mark, $uric,
    $urics, $uric_no_slash, $escaped, $hostname, etc.) are also exported,
    mapped to sensible RFC 3986 equivalents.

EXPORTS
    Nothing is exported by default. Use the following tags or individual
    names.

  Export tags
    ":low"
        Base character class building blocks: $digit, $upalpha, $lowalpha,
        $alpha, $alphanum, $hex, $hexdig, $escaped, $pct_encoded, $mark,
        $unreserved, $sub_delims, $reserved, $pchar, $uric, $urics,
        $userinfo, $userinfo_no_colon, $uric_no_slash.

    ":parts"
        Path and query/fragment productions: $query, $fragment, $param,
        $segment, $segment_nz, $segment_nz_nc, $path_abempty,
        $path_absolute, $path_noscheme, $path_rootless, $path_empty,
        $path_segments, $ftp_segments, $rel_segment, $abs_path, $rel_path,
        $path.

    ":connect"
        Host and authority productions: $port, $dec_octet, $IPv4address,
        $hextet, $ls32, $IPv6address, $IPvFuture, $IP_literal, $toplabel,
        $domainlabel, $hostname, $host, $hostport, $server, $reg_name,
        $authority.

    ":URI"
        Top-level URI productions: $scheme, $net_path, $opaque_part,
        $hier_part, $relative_part, $relativeURI, $absoluteURI,
        $relative_ref, $URI_reference.

    ":IDN"
        Optional non-normative Unicode/IDN helpers: $IDN_DOT, $ACE,
        $IDN_U_LABEL, $IDN_HOST.

    ":ALL"
        All of the above.

  Optional Unicode/IDN helpers
    RFC 3986 is ASCII-only at the syntax level; internationalised host names
    are to be represented as A-labels (punycode). For callers who want to
    pre-validate Unicode host names before ACE conversion, the following
    non-normative helpers are also exported under the ":IDN" tag:

    $IDN_DOT
        Recognises "." and the three IDNA dot-equivalents (U+3002, U+FF0E,
        U+FF61).

    $ACE
        Case-insensitive "xn--" punycode prefix.

    $IDN_U_LABEL
        A single Unicode label of at most 63 characters, with the ACE hyphen
        rule enforced: "--" at positions 3-4 is only permitted for ACE
        labels.

    $IDN_HOST
        One or more Unicode labels separated by $IDN_DOT.

    These variables are *non-normative* conveniences and are not used by the
    RFC 3986 $host production, which remains ASCII per the specification.

DEPENDENCIES
    None beyond Exporter, which is part of the Perl core.

REFERENCES
    [RFC 3986]
        Berners-Lee, T., Fielding, R., and Masinter, L.: *Uniform Resource
        Identifiers (URI): Generic Syntax*. January 2005. Supersedes RFC
        2732, RFC 2396, and RFC 1808. <http://tools.ietf.org/html/rfc3986>

    [RFC 2396]
        Berners-Lee, T., Fielding, R., and Masinter, L.: *Uniform Resource
        Identifiers (URI): Generic Syntax*. August 1998.
        <http://tools.ietf.org/html/rfc2396>

COMPATIBILITY
    This module has been tested on Perl 5.10 and 5.12 via perlbrew (local),
    and on Perl 5.14 through 5.40 via the GitLab CI pipeline.

SEE ALSO
    Regexp::Common::URI::RFC2396 in the "Regexp-Common" distribution, which
    this module supersedes.

AUTHOR
    Jacques Deguest <jack@deguest.jp>

    The export structure and variable naming follow the conventions
    established by Damian Conway and Abigail in
    "Regexp::Common::URI::RFC2396".

COPYRIGHT & LICENSE
    Copyright (c) 2025-2026, Jacques Deguest <jack@deguest.jp>

    You can use, copy, modify and redistribute this package and associated
    files under the same terms as Perl itself.