DataWorks Invalid regular expression pattern

错误：invalid regular expression pattern: in function rlike, pattern cannot be empty string

代码：
MAX(
CASE WHEN c.brand_id IS NULL
OR a.title IS NULL
OR c.op_brand_words IS NULL THEN 0
WHEN c.brand_id IS NOT NULL AND c.op_brand_words = '' THEN 0
WHEN c.brand_id IS NOT NULL AND a.title RLIKE REGEXP_REPLACE(REGEXP_REPLACE(c.op_brand_words,'[[:punct:]]',''),'，','|') THEN 1
ELSE 0
END
) AS itm_brand_in_title_b