Cheyne Li wrote:
>  Sorry, I wasn't finish when I mistakely posted it.
>  
>  I tested
>            i=0
>            line.scan(fkey){|x|i=i+1}
>            puts i
>            if i>0
>              puts "Found match...\n\r"
>            end
>  
>  in other file by assgined fkey and line. it worked
>  
>  but the function itself couldn't find match at all. I have no idea 
>  what's wrong with it. Is there anyone can help me out? Thanks a lot

If I'm understanding you correctly, you have lets say an array of keys 
you want to find in a file.

fileKeys = ["key1","key44","key5"]

lets just say the file contains a bunch of useless jargon and some keys:

testfile.txt #

stuff
more stuff
key5
useless junk
more useless junk
not a key
key44


Ok, now lets read that file and put the keys in an array called results

results = []

IO.foreach("testfile.txt") {|x| results << x.chomp}
=>  nil

Now we compare the arrays to find any matches

results&fileKeys
=>  ["key5","key44"]

Regards,

- Mac
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