diff --git a/lib/private/DB/AdapterOCI8.php b/lib/private/DB/AdapterOCI8.php
index d67308c538b4..011180f68115 100644
--- a/lib/private/DB/AdapterOCI8.php
+++ b/lib/private/DB/AdapterOCI8.php
@@ -41,7 +41,7 @@ public function lastInsertId($table) {
 
 	public function fixupStatement($statement) {
 		$statement = \preg_replace('( LIKE \?)', '$0 ESCAPE \'\\\'', $statement);
-		$statement = \preg_replace('/`(\w+)` ILIKE \?/', 'REGEXP_LIKE(`$1`, \'^\' || REPLACE(?, \'%\', \'.*\') || \'$\', \'i\')', $statement);
+		$statement = \preg_replace('/`(\w+)` ILIKE \?/', "REGEXP_LIKE(`$1`, '^' || REPLACE(REGEXP_REPLACE(REPLACE(?, '[', '\\['), '(\\]|[\\*+?|^$.[(){}])', '\\\\\\1'), '%', '.*') || '$', 'i')", $statement);
 		$statement = \str_replace('`', '"', $statement);
 		$statement = \str_ireplace('NOW()', 'CURRENT_TIMESTAMP', $statement);
 		$statement = \str_ireplace('UNIX_TIMESTAMP()', self::UNIX_TIMESTAMP_REPLACEMENT, $statement);
diff --git a/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php b/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
index 8fbb4d6937cd..aa906b0f1577 100644
--- a/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
+++ b/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
@@ -158,7 +158,7 @@ public function castColumn($column, $type) {
 	public function iLike($x, $y, $type = null) {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
-		return new QueryFunction('REGEXP_LIKE('.$x.', \'^\' || REPLACE('.$y.', \'%\', \'.*\') || \'$\', \'i\')');
+		return new QueryFunction("REGEXP_LIKE($x, '^' || REPLACE(REGEXP_REPLACE(REPLACE($y, '[', '\\['), '(\\]|[\\*+?|^$.[(){}])', '\\\\\\1'), '%', '.*') || '$', 'i')");
 	}
 
 	/**