SAS Language Reference: Dictionary

Pattern Matching Using Regular Expression (RX) Functions and CALL Routines

You can use a special group of functions and CALL routines to match or change data according to a specific pattern that you specify. By using these functions and CALL routines, you can determine whether a given character string is in a set denoted by a pattern, or you can search a given character string for a substring in a set denoted by a pattern. You can also change a matched substring to a different substring.

This group consists of CALL RXCHANGE, CALL RXFREE, CALL RXSUBSTR, RXMATCH, and RXPARSE, and comprises the character string matching category for functions and CALL routines. For a description of these functions, see Functions and CALL Routines by Category.

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