We are constantly needing ways to search for patterns in text, and change particular pieces of text. With the advent of SAS® 9, the power of Perl's regular expressions is now available in the DATA step. The PRX functions and call routines let you to use the pattern matching features of Perl 5.6.1 to do these tasks, and more. This paper will explain what regular expressions are, and how to write basic Perl regular expressions. It will also show how to code the more useful PRX functions, and how to use these functions to search for text and replace text
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