diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index df0ce6a..bad641d 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1566,11 +1566,11 @@
 				'\s*>\s*',                       // >
 				'\s+IS NULL',                    // IS NULL
 				'\s+IS NOT NULL',                // IS NOT NULL
-				'\s+EXISTS\s*\([^\)]+\)',        // EXISTS(sql)
-				'\s+NOT EXISTS\s*\([^\)]+\)',    // NOT EXISTS(sql)
+				'\s+EXISTS\s*\(.*\)',        // EXISTS(sql)
+				'\s+NOT EXISTS\s*\(.*\)',    // NOT EXISTS(sql)
 				'\s+BETWEEN\s+',                 // BETWEEN value AND value
-				'\s+IN\s*\([^\)]+\)',            // IN(list)
-				'\s+NOT IN\s*\([^\)]+\)',        // NOT IN (list)
+				'\s+IN\s*\(.*\)',            // IN(list)
+				'\s+NOT IN\s*\(.*\)',        // NOT IN (list)
 				'\s+LIKE\s+\S.*('.$_les.')?',    // LIKE 'expr'[ ESCAPE '%s']
 				'\s+NOT LIKE\s+\S.*('.$_les.')?' // NOT LIKE 'expr'[ ESCAPE '%s']
 			);