MySQL error in file: /engine/api/api.class.php at line 390

Error Number: 3685

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

SQL query:

Select * from ero_post where (category regexp "[[:<:]](31)[[:>:]]") AND approve = 1 AND date < "2025-07-09 00:33:37" AND id != 4364 AND id > 4364 order by id ASC limit 0,3