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  1. or download this
    # Text.
$text = 'Renata';
$window =~ /\b\Q$text\E\b/ism
  2. or download this
    # Uncompiled regexp.
$text = 'Renata';
$regexp = '\\b' . quotemeta($text) . '\\b';
$window =~ /$regexp/ism
  3. or download this
    # Compiled regexp.
$regexp = qr/\b\QRenata\E\b/ism;
$window =~ $regexp