Skip XML content while doing regex search and replace

[Bronwen]

I have a xml string as follows\[code\]<root> <A id="1">This is an example</A> <B id="2"> <C id="3">this is tag c</C> </B> <D id="4">this is tag d</D> <E id="5"> <F id="6">this is tag f</F> <G id="7">this is tag g</G> . . . </E></root>\[/code\]here i just want to search the word \[code\]tag\[/code\] and replace it by \[code\]Xml Tag\[/code\] using regex(Regular Expression), and i dont want to search that word inside the element \[code\]<E>...</E>\[/code\] i.e., i want to skip element \[code\]<E>...</E>\[/code\] while search and replace.Any help is appreciated.Thanks in advance.