Simple DBI search with slashes do not return anything

 my $string = '/a/b/c';
 my $req = qq{ SELECT * FROM `texts` WHERE `string`=?};
 my $sth = $dbh->prepare($req);
 my $row = $sth->execute($string);
 say "row = $row";
[download]

produce: row = 0E0

Table `texts`: string varchar(256) utf8_general_ci

How can I perform exact search strings with with slashes?