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In version 9, the SAS® System introduces Perl regular expressions (sometimes known by the acronym PRX, the first three letters of these functions or call routines). However, previous versions of SAS® already had regular expressions (known by their acronym RX, the first two letters of these functions or call routines). This presentation will describe specific functional and performance differences in these two exclusive regular expression strategies, and offer recommendations on when to use each strategy. The technologies will be compared using SAS Enterprise Guide® 4.3.