from here: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-RelationalOperators A RLIKE B stringsNULL if A or B is NULL, TRUE if any (possibly empty) substring of A matches the Java regular expression B, otherwise FALSE. E.g. 'foobar' RLIKE 'foo' evaluates to FALSE whereas 'foobar' RLIKE '^f.*r$' evaluates to TRUE. 'foobar' RLIKE 'foo' evaluates to TRUE doesn't it?
--Darren
