MySQL error in file: /engine/api/api.class.php at line 362

Error Number: 3685

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

SQL query:

Select * from dle_post where (category regexp "[[:<:]](121)[[:>:]]") AND approve = 1 AND date < "2024-04-26 23:20:04" AND id != 45210 AND id < 45210 order by id DESC limit 0,20