2. The process of claim 1 , wherein a sub-expression is either a regular expression or a position expression or an atomic expression or a concatenate expression, and wherein said ranking schemes are established for ranking each of said regular expressions, position expressions, atomic expressions, and concatenate expressions, in that order.
2. The process of claim 1 , wherein a sub-expression is either a regular expression or a position expression or an atomic expression or a concatenate expression, and wherein said ranking schemes are established for ranking each of said regular expressions, position expressions, atomic expressions, and concatenate expressions, in that order. 12. The process of claim 2 , wherein the process action of establishing ranking schemes for concatenate expressions comprises combining scores for individual atomic expressions found in a concatenate expression.