MySQL error in file: /engine/modules/show.full.php at line 985

Error Number: 3685

The Error returned was:
Illegal argument to a regular expression.

SQL query:

SELECT id, date, short_story, xfields, title, category, alt_name FROM dle_post WHERE category regexp '[[:<:]](5)[[:>:]]' AND MATCH (title, short_story, full_story, xfields) AGAINST ('Sutte Hakkun 2 6-3 ') AND id != 7178 AND approve=1 AND date < '2025-03-11 00:02:22' LIMIT 5