Apology for the message. I want to make the number of lines short considering server space. Let me explain it in detail.
I have the code like this

<author-group>
     <auth>
        </auth>
     <auth>
        </auth>
     <auth>
        </auth>
<aff>
</aff>
<aff>
</aff>
<corres id="cor1">
</corres>
</author-group>
[download]

I want to group all <auth> tags in a separate tag like

<author-group>
<XXX>
     <auth>
        </auth>
     <auth>
        </auth>
     <auth>
        </auth>
<XXX>
<aff>
</aff>
<aff>
</aff>
<corres id="cor1">
</corres>
</author-group>
[download]

I tried this using regular expression. I can’t get the “</auth>carriage return <aff>”. Please advice.

Could you please suggest any book to learn basics of perl.

Edit: g0n - code tags

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