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ip=xxx
port=yyy
sed '35,40{s/\(.*:\/\/\)\([0-9].[0-9].[0-9].[0-9]\):\([0-9]\{3\}\)\(.*\)/\1'$ip':'$port'\4/}' xml

Can you give a simple example for your requirement?

sed '40a '$input' ' xml


or


awk 'NR==40 {$0=$0"\n""'$input'"}1' xmlfile