MySQL error in file: /engine/modules/show.full.php at line 1023

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 blg_post WHERE category regexp '[[:<:]](2|11|12|11|10)[[:>:]]' AND MATCH (title, short_story, full_story, xfields) AGAINST ('#4 NOVO POS - Setup Seating Area  Video tutorial teach user how to setup restaurant, shop or cafe seating or tables location.') AND id != 9 AND approve=1 AND date < '2024-11-21 18:08:57' LIMIT 4