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# Text.
$text = 'Renata';
$window =~ /\b\Q$text\E\b/ism

# Uncompiled regexp.
$text = 'Renata';
$regexp = '\\b' . quotemeta($text) . '\\b';
$window =~ /$regexp/ism

# Compiled regexp.
$regexp = qr/\b\QRenata\E\b/ism;
$window =~ $regexp