diff --git a/lib/private/group/database.php b/lib/private/group/database.php
index baaf2cf273914259cb2e4322524293d0c1f87d27..b7148f38fe34eb0d478cd0fd591bc6cd5e76eda0 100644
--- a/lib/private/group/database.php
+++ b/lib/private/group/database.php
@@ -169,7 +169,7 @@ class OC_Group_Database extends OC_Group_Backend {
 	 */
 	public function getGroups($search = '', $limit = null, $offset = null) {
 		$stmt = OC_DB::prepare('SELECT `gid` FROM `*PREFIX*groups` WHERE `gid` LIKE ?', $limit, $offset);
-		$result = $stmt->execute(array($search.'%'));
+		$result = $stmt->execute(array('%' . $search . '%'));
 		$groups = array();
 		while ($row = $result->fetchRow()) {
 			$groups[] = $row['gid'];
@@ -203,7 +203,7 @@ class OC_Group_Database extends OC_Group_Backend {
 		$stmt = OC_DB::prepare('SELECT `uid` FROM `*PREFIX*group_user` WHERE `gid` = ? AND `uid` LIKE ?',
 			$limit,
 			$offset);
-		$result = $stmt->execute(array($gid, $search.'%'));
+		$result = $stmt->execute(array($gid, '%'.$search.'%'));
 		$users = array();
 		while ($row = $result->fetchRow()) {
 			$users[] = $row['uid'];
@@ -220,8 +220,12 @@ class OC_Group_Database extends OC_Group_Backend {
 	 */
 	public function countUsersInGroup($gid, $search = '') {
 		$stmt = OC_DB::prepare('SELECT COUNT(`uid`) AS `count` FROM `*PREFIX*group_user` WHERE `gid` = ? AND `uid` LIKE ?');
-		$result = $stmt->execute(array($gid, $search.'%'));
-		return $result->fetchOne();
+		$result = $stmt->execute(array($gid, '%' . $search . '%'));
+		$count = $result->fetchOne();
+		if($count !== false) {
+			$count = intval($count);
+		}
+		return $count;
 	}
 
 }
diff --git a/lib/private/group/dummy.php b/lib/private/group/dummy.php
index e48c6a0e266ca2204e9f866d83112da9f2eff969..4af18b267bcf37a12476dfc0c73ab65bc1fbdc12 100644
--- a/lib/private/group/dummy.php
+++ b/lib/private/group/dummy.php
@@ -143,7 +143,16 @@ class OC_Group_Dummy extends OC_Group_Backend {
 	 * @return array an array of group names
 	 */
 	public function getGroups($search = '', $limit = -1, $offset = 0) {
-		return array_keys($this->groups);
+		if(empty($search)) {
+			return array_keys($this->groups);
+		}
+		$result = array();
+		foreach(array_keys($this->groups) as $group) {
+			if(stripos($group, $search) !== false) {
+				$result[] = $group;
+			}
+		}
+		return $result;
 	}
 
 	/**
@@ -156,7 +165,16 @@ class OC_Group_Dummy extends OC_Group_Backend {
 	 */
 	public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
 		if(isset($this->groups[$gid])) {
-			return $this->groups[$gid];
+			if(empty($search)) {
+				return $this->groups[$gid];
+			}
+			$result = array();
+			foreach($this->groups[$gid] as $user) {
+				if(stripos($user, $search) !== false) {
+					$result[] = $user;
+				}
+			}
+			return $result;
 		}else{
 			return array();
 		}
@@ -172,7 +190,16 @@ class OC_Group_Dummy extends OC_Group_Backend {
 	 */
 	public function countUsersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
 		if(isset($this->groups[$gid])) {
-			return count($this->groups[$gid]);
+			if(empty($search)) {
+				return count($this->groups[$gid]);
+			}
+			$count = 0;
+			foreach($this->groups[$gid] as $user) {
+				if(stripos($user, $search) !== false) {
+					$count++;
+				}
+			}
+			return $count;
 		}
 	}
 
diff --git a/lib/private/user/database.php b/lib/private/user/database.php
index d9263f6b5de3cbee59ce4d8e0c27f199aface482..e9844f0f79ceafcc6fb5a7365871aca9293f4913 100644
--- a/lib/private/user/database.php
+++ b/lib/private/user/database.php
@@ -158,7 +158,7 @@ class OC_User_Database extends OC_User_Backend {
 		$query = OC_DB::prepare('SELECT `uid`, `displayname` FROM `*PREFIX*users`'
 			. ' WHERE LOWER(`displayname`) LIKE LOWER(?) OR '
 			. 'LOWER(`uid`) LIKE LOWER(?)', $limit, $offset);
-		$result = $query->execute(array($search . '%', $search . '%'));
+		$result = $query->execute(array('%' . $search . '%', '%' . $search . '%'));
 		$users = array();
 		while ($row = $result->fetchRow()) {
 			$displayNames[$row['uid']] = $row['displayname'];
@@ -232,7 +232,7 @@ class OC_User_Database extends OC_User_Backend {
 	 */
 	public function getUsers($search = '', $limit = null, $offset = null) {
 		$query = OC_DB::prepare('SELECT `uid` FROM `*PREFIX*users` WHERE LOWER(`uid`) LIKE LOWER(?)', $limit, $offset);
-		$result = $query->execute(array($search . '%'));
+		$result = $query->execute(array('%' . $search . '%'));
 		$users = array();
 		while ($row = $result->fetchRow()) {
 			$users[] = $row['uid'];
diff --git a/lib/private/user/dummy.php b/lib/private/user/dummy.php
index 776168048f6cfaacc6b7d95ea1d7945ee26b9909..dbcbb2a46f7a266996cc0b91195be4c17b15b1fd 100644
--- a/lib/private/user/dummy.php
+++ b/lib/private/user/dummy.php
@@ -105,7 +105,16 @@ class OC_User_Dummy extends OC_User_Backend {
 	 * Get a list of all users.
 	 */
 	public function getUsers($search = '', $limit = null, $offset = null) {
-		return array_keys($this->users);
+		if(empty($search)) {
+			return array_keys($this->users);
+		}
+		$result = array();
+		foreach(array_keys($this->users) as $user) {
+			if(stripos($user, $search) !== false) {
+				$result[] = $user;
+			}
+		}
+		return $result;
 	}
 
 	/**
diff --git a/tests/lib/group/backend.php b/tests/lib/group/backend.php
index 2c563ae9ac9b1439cbf38bbb214ac00bf75e37b9..95a5cf5f49ca351dcdebb7372b1b349db692ef3e 100644
--- a/tests/lib/group/backend.php
+++ b/tests/lib/group/backend.php
@@ -31,8 +31,12 @@ abstract class Test_Group_Backend extends PHPUnit_Framework_TestCase {
 	 * test cases can override this in order to clean up created groups
 	 * @return string
 	 */
-	public function getGroupName() {
-		return uniqid('test_');
+	public function getGroupName($name = null) {
+		if(is_null($name)) {
+			return uniqid('test_');
+		} else {
+			return $name;
+		}
 	}
 
 	/**
@@ -88,7 +92,7 @@ abstract class Test_Group_Backend extends PHPUnit_Framework_TestCase {
 		$this->assertFalse($this->backend->inGroup($user2, $group1));
 		$this->assertFalse($this->backend->inGroup($user1, $group2));
 		$this->assertFalse($this->backend->inGroup($user2, $group2));
-		
+
 		$this->assertFalse($this->backend->addToGroup($user1, $group1));
 
 		$this->assertEquals(array($user1), $this->backend->usersInGroup($group1));
@@ -102,4 +106,38 @@ abstract class Test_Group_Backend extends PHPUnit_Framework_TestCase {
 		$this->assertEquals(array(), $this->backend->usersInGroup($group1));
 		$this->assertFalse($this->backend->inGroup($user1, $group1));
 	}
+
+	public function testSearchGroups() {
+		$name1 = $this->getGroupName('foobarbaz');
+		$name2 = $this->getGroupName('bazbarfoo');
+		$name3 = $this->getGroupName('notme');
+
+		$this->backend->createGroup($name1);
+		$this->backend->createGroup($name2);
+		$this->backend->createGroup($name3);
+
+		$result = $this->backend->getGroups('bar');
+		$this->assertSame(2, count($result));
+	}
+
+	public function testSearchUsers() {
+		$group = $this->getGroupName();
+		$this->backend->createGroup($group);
+
+		$name1 = 'foobarbaz';
+		$name2 = 'bazbarfoo';
+		$name3 = 'notme';
+
+		$this->backend->addToGroup($name1, $group);
+		$this->backend->addToGroup($name2, $group);
+		$this->backend->addToGroup($name3, $group);
+
+		$result = $this->backend->usersInGroup($group, 'bar');
+		$this->assertSame(2, count($result));
+
+		$result = $this->backend->countUsersInGroup($group, 'bar');
+		$this->assertSame(2, $result);
+	}
+
+
 }
diff --git a/tests/lib/group/database.php b/tests/lib/group/database.php
index 3e05c656061c9c55953e80da28ba5203483e44d1..9b39ac004524c0384d029ed6525972562fb25d9d 100644
--- a/tests/lib/group/database.php
+++ b/tests/lib/group/database.php
@@ -28,8 +28,10 @@ class Test_Group_Database extends Test_Group_Backend {
 	 * test cases can override this in order to clean up created groups
 	 * @return string
 	 */
-	public function getGroupName() {
-		$name=uniqid('test_');
+	public function getGroupName($name = null) {
+		if(is_null($name)) {
+			$name=uniqid('test_');
+		}
 		$this->groups[]=$name;
 		return $name;
 	}
diff --git a/tests/lib/user/backend.php b/tests/lib/user/backend.php
index 1384c54a92161dd8971d53f1803a97acb4cc1852..0d3914c7ca68d19afd58a9f7e2e9ffa7983978a3 100644
--- a/tests/lib/user/backend.php
+++ b/tests/lib/user/backend.php
@@ -96,4 +96,21 @@ abstract class Test_User_Backend extends PHPUnit_Framework_TestCase {
 		$this->assertSame($name1, $this->backend->checkPassword($name1, 'newpass1'));
 		$this->assertFalse($this->backend->checkPassword($name2, 'newpass1'));
 	}
+
+	public function testSearch() {
+		$name1 = 'foobarbaz';
+		$name2 = 'bazbarfoo';
+		$name3 = 'notme';
+
+		$this->backend->createUser($name1, 'pass1');
+		$this->backend->createUser($name2, 'pass2');
+		$this->backend->createUser($name3, 'pass3');
+
+		$result = $this->backend->getUsers('bar');
+		$this->assertSame(2, count($result));
+
+		$result = $this->backend->getDisplayNames('bar');
+		$this->assertSame(2, count($result));
+	}
+
 }
diff --git a/tests/lib/user/database.php b/tests/lib/user/database.php
index d7cc39ae387831e48c78891d4fe691ae7ccd392d..a8e497720c235da83f0927fc61ae531eccdb0aa2 100644
--- a/tests/lib/user/database.php
+++ b/tests/lib/user/database.php
@@ -32,6 +32,9 @@ class Test_User_Database extends Test_User_Backend {
 	}
 	
 	public function tearDown() {
+		if(!isset($this->users)) {
+			return;
+		}
 		foreach($this->users as $user) {
 			$this->backend->deleteUser($user);
 		}