Regular expressions are used by many programming languages to search for certain patterns in text. SAS is one such language that supports regular expressions for pattern matching. In the RX library of functions, RXPARSE is commonly used to parse a pattern in a string, be it a number, a letter, a character or a string of characters.
Often, clinical programmers are faced with the challenge of extracting numbers in a stream of alpha-numeric output. This paper focuses on one solution to this problem. In particular, it explains how to extract the matrix of coefficients from the Expected Mean Square output of a MIXED Procedure. This code is part of a macro to automate statistical processing in support of early drug development and discovery.
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