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 "[[:<:]](7)[[:>:]]") AND approve = 1 AND date < "2024-04-26 18:22:11" AND id != 755 AND id < 755 order by id DESC limit 0,20