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Syntax for begins with in SAS

Posted on 2011-09-09
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Can someone please tell me the syntax for begins with in SAS.

ie.  I would like to select all records where code begins with "SNR".
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Question by:morinia
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d507201 earned 1000 total points
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Use the substring function for this --
     if substr(varName,1,3)='SNR';

When you're looking for a character string contained anywhere in a variable, use the INDEX or FIND functions.  Find is a bit more robust because it has a switch that ignores case and also a switch that ignores trailing balnks.

if index(varname,'SNR') will identify things like ABCSNR123.
if find(varname,'SNR','i') will identify both ABCSNR123 and ABcSnR123 because it ignores case.

Here's a clever one.  Don't forget the REVERSE function.  It does just that--reverses a character string so that SNRABC123 becomes 321CBARNS.  So if you have a string that have varying length and you need to check to see if the last three characters are SNR, then you could use
     if substr(reverse(varname),1,3)='RNS

Ron Cody's book 'SAS Functions by Example' is a good investment.
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