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<heading level=2>
    Introduction to Arguments</heading>

<heading>
    <index primary-key="procedures" secondary-key="definition, rest ar
+guments in"/>
    <index primary-key="rest arguments" secondary-key="specifying, in 
+procedure definition"/>
    level=3,
    Specifying Rest Arguments in a Procedure Definition</heading>

<heading2>
    Introduction to Arguments</heading2>

<heading3>
    <index primary-key="procedures" secondary-key="definition, rest ar
+guments in"/>
    <index primary-key="rest arguments" secondary-key="specifying, in 
+procedure definition"/>
    Specifying Rest Arguments in a Procedure Definition</heading3>

$text =~ s/<heading([^(<\/heading>)]*?)level=(.{1})([^(<\/heading>)]*?
+)<\/heading>/<heading$2>$1$3<\/heading$2>/gsix;