SYNOPSIS

   Assuming this runs on Perl 5.14 or newer.

    use Regexp::Stringify qw(stringify_regexp);
    $str = stringify_regexp(regexp=>qr/a/i);                       # '(^i:a)'
    $str = stringify_regexp(regexp=>qr/a/i, with_qr=>1);           # 'qr(a)i'
    $str = stringify_regexp(regexp=>qr/a/i, plver=>5.010);         # '(?:(?i-)a)'
    $str = stringify_regexp(regexp=>qr/a/ui, plver=>5.010);        # '(?:(?i-)a)'

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