Hi again, thanks to everyone who helped my yesterday, now i have a new problem. I have two files, one is a string of letters the other is a file containing start and stop positions on the string. can anyone think of a way of mapping all start/stop positions to the string and replacing the letters between them with X's ??? i'm really stuck. I have used a while loop to split the file containing the start/stop positions into elements. And I know i need to increment a $count variable to count the string but have no idea how to map the start/stop positions to the string. I would really like to learn from someone with superior perl knowledge. Thanks, lolly.

In reply to another tricky one from lol by lolly

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