MySQL error in file: /engine/modules/show.full.php at line 981

Error Number: 3685

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

SQL query:

SELECT /*related_ids_2*/ id, date, short_story, xfields, title, category, alt_name FROM dle_post WHERE category regexp '[[:<:]](20204|12|2022|2023|2024|2025|20021|20034|39|1|2|13|4872|4873|4874|20146|20147|20148|20149|20150|20151|20152|20153|20154|20204|59)[[:>:]]' AND MATCH (title, short_story, full_story, xfields) AGAINST ('Верные до конца ') AND id != 215065 AND approve=1 LIMIT 12