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recursively delete the text between 2 strings from a file

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# 1  
Old 12-29-2008
recursively delete the text between 2 strings from a file
i have 200000bytes size of a unix file i need to delete some text between two strings recursively using a loop with sed or awk . these two strings are : 1st string getting from a file :::2 nd string is fi...its constant . can anyone help me sed -n'/<1 st string >/,/fi/' <input_filename> is the command i want to use ....
# 2  
Old 12-29-2008
Could you post a couple of lines of the file as an example?
# 3  
Old 12-29-2008
using below code
for i in `cat <first_string_used_file>`
do
sed -n '/$i/,/fi/' <input_file> >> lbl_file
done
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