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FIRST    MIDDLE    LAST    STRNO        CITY    STATE    ZIP    1    2
+    3    4    5
FIRST    MIDDLE    LAST    STRNO        CITY    STATE    ZIP    1    2
+    3    4
FIRST    MIDDLE    LAST    STRNO        CITY    STATE    ZIP

ZIP    FIRST    MIDDLE    LAST    STRNO        CITY    3    
STATE    FIRST    MIDDLE    LAST    STRNO        2    
LAST    FIRST    CITY

C:\b\perlmonks\commands>sed -n "s/^\([^\t]*\t\)[^\t]*\t\([^\t]*\t\)[^\
+t]*\t[^\t]*\t\([^\t]*\).*/\2\1\3/p" sedtest.csv 
LAST    FIRST    CITY
LAST    FIRST    CITY
LAST    FIRST    CITY