They walk among us - the greppers. One might be sitting next to you at this very moment. In fact, you might be one yourself. Yes, you! You may never have grepped before; you may not even know what grepping is; yet chances are good that within you too, inchoate and amorphous, has stirred a secret need to grep. Now that I have your attention, what on earth am I talking about? The fact that GREP originates as a Unix acronym for "global regular expression and print" need neither detain nor deter us