krugs - 8:25 pm on Jan 24, 2009 (gmt 0) [perldoc.perl.org...]
You can learn the tr/// operator in five minutes. It has very few options and is no where near as powerful and complicated as m// or s/// regular expressions. The perl FAQS has many cookbook style answer/question FAQS that all perl coders should become familiar with.
They come with perl or you can read them online: