phpman > perldoc > Tie::Hash::NamedCapture(3perl)

NAME
    Tie::Hash::NamedCapture - Named regexp capture buffers

SYNOPSIS
        tie my %hash, "Tie::Hash::NamedCapture";
        # %hash now behaves like %+

        tie my %hash, "Tie::Hash::NamedCapture", all => 1;
        # %hash now access buffers from regexp in $qr like %-

DESCRIPTION
    This module is used to implement the special hashes "%+" and "%-", but it can be used to tie
    other variables as you choose.

    When the "all" parameter is provided, then the tied hash elements will be array refs listing the
    contents of each capture buffer whose name is the same as the associated hash key. If none of
    these buffers were involved in the match, the contents of that array ref will be as many "undef"
    values as there are capture buffers with that name. In other words, the tied hash will behave as
    "%-".

    When the "all" parameter is omitted or false, then the tied hash elements will be the contents
    of the leftmost defined buffer with the name of the associated hash key. In other words, the
    tied hash will behave as "%+".

    The keys of "%-"-like hashes correspond to all buffer names found in the regular expression; the
    keys of "%+"-like hashes list only the names of buffers that have captured (and that are thus
    associated to defined values).

    This implementation has been moved into the core executable, but you can still load this module
    for backward compatibility.

SEE ALSO
    perlreapi, re, "Pragmatic Modules" in perlmodlib, "%+" in perlvar, "%-" in perlvar.