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Use Regular Expressions in Proc SQL

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You can use regular expressions within SQL. This can be quite powerful in selecting data that matches certain conditions. The following example shows a simple regular expression which selects only quarterly periods from a table containing years, quarters & months.

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  1. data test ;
  2.  
  3.   length period $ 7 ;
  4.  
  5.   input period ;
  6.  
  7. cards ;
  8.  
  9. 2005
  10.  
  11. 2005Q1
  12.  
  13. 2005JAN
  14.  
  15. ;;
  16.  
  17. run ;
  18.  
  19. proc sql;
  20.  
  21.   create table qtrs as
  22.  
  23.     select *
  24.  
  25.       from test
  26.  
  27.         where prxmatch("/\d\d\d\d[qQ][1-4]/",period) ;
  28.  
  29. quit;
  30.  
  31. proc print data=qtrs ;
  32.  
  33. run ;

URL: http://jaredprins.squarespace.com/blog/2008/10/7/some-sas-code-snippets.html

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