QUERY: SELECT 1 REGEXP \'\'
ERROR: Got error \'empty (sub)expression\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'(\'
ERROR: Got error \'parentheses not balanced\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'[\'
ERROR: Got error \'brackets ([ ]) not balanced\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'\\\\\'
ERROR: Got error \'trailing backslash (\\)\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'*\'
ERROR: Got error \'repetition-operator operand invalid\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'a{1,1,1}\'
ERROR: Got error \'invalid repetition count(s)\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'[a-9]\'
ERROR: Got error \'invalid character range\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'a{1,\'
ERROR: Got error \'braces not balanced\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'[[.ab.]]\'
ERROR: Got error \'invalid collating element\' FROM REGEXP
QUERY: SELECT 1 REGEXP \'[[:ab:]]\'
ERROR: Got error \'invalid character class\' FROM REGEXP