finding a string in the current html page

i want to search for a string in the current HTML page which occurs betwwen two specified strings....
for example if my current html page contains
"what is your name?"

and i want to search for string between "what" and "name"
so it should return

" is your "

basically it should be somthing simillar to php's pragma_match
any replies will higly be appericiated
thx

 

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