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REGEXP and RLIKE are non-reserved keywords prior to Hive 2.0.0 and reserved keywords starting in Hive 2.0.0 (HIVE-11703).

ALL,ALTER,AND,ARRAY,AS,AUTHORIZATION,BETWEEN,BIGINT,BINARY,BOOLEAN,BOTH,BY,CASE,CAST,
CHAR,COLUMN,CONF,CREATE,CROSS,CUBE,CURRENT,CURRENT_DATE,CURRENT_TIMESTAMP,CURSOR,
DATABASE,DATE,DECIMAL,DELETE,DESCRIBE,DISTINCT,DOUBLE,DROP,ELSE,END,EXCHANGE,EXISTS,
EXTENDED,EXTERNAL,FALSE,FETCH,FLOAT,FOLLOWING,FOR,FROM,FULL,FUNCTION,GRANT,GROUP,
GROUPING,HAVING,IF,IMPORT,IN,INNER,INSERT,INT,INTERSECT,INTERVAL,INTO,IS,JOIN,LATERAL,
LEFT,LESS,LIKE,LOCAL,MACRO,MAP,MORE,NONE,NOT,NULL,OF,ON,OR,ORDER,OUT,OUTER,OVER,
PARTIALSCAN,PARTITION,PERCENT,PRECEDING,PRESERVE,PROCEDURE,RANGE,READS,REDUCE,
REGEXP (Hive 2.0.0 onward),REVOKE,RIGHT,RLIKE (Hive 2.0.0 onward),ROLLUP,ROW,ROWS,
SELECT,SET,SMALLINT,TABLE,TABLESAMPLE,THEN,TIMESTAMP,TO,TRANSFORM,TRIGGER,TRUE,
TRUNCATE,UNBOUNDED,UNION,UNIQUEJOIN,UPDATE,USER,USING,VALUES,VARCHAR,WHEN,WHERE,
WINDOW,WITH