MySQL REGEXP. How to escape the "[" character?

Question

PHP

Friends, good night.
Tell me, please, what template can be used to escape a string? so that it can insert into mysql-query SELECT ....... WHERE title REGEXP '".$query."' ... Now an error is thrown due to the character "[".. But I can't escape it in any way.. I try like this: Please tell me the correct shielding .. I would be very grateful.
$query = "[hjybrb";
str_replace("[", "\[", $query)

Answer 1

You were only a minute away from the solution: for some historical reason, there should be two slashes :/
str_replace ('[', '\\[', $query)