diff --git a/cake/libs/string.php b/cake/libs/string.php
index f3e1da4b7..e3a7d003b 100644
--- a/cake/libs/string.php
+++ b/cake/libs/string.php
@@ -237,7 +237,24 @@ class String extends Object {
 			$str = str_replace($options['escape'].$options['before'], $options['before'], $str);
 		}
 		if ($options['clean']) {
-			$str = preg_replace(sprintf('/(%s[^\s]+[\s]*|[\s]*%s[^\s]+)/', $options['before'], $options['before']), '', $str);
+			if ($options['clean'] === true) {
+				$options['clean'] = array();
+			}
+			$options['clean'] = am(array(
+				'word' => '[\w,]+',
+				'gap' => '[\s]*(?:(?:and|or)[\s]*)?'
+			), $options);
+
+			$kleenex = sprintf(
+				'/(%s%s%s|%s%s%s)/',
+				$options['before'],
+				$options['clean']['word'],
+				$options['clean']['gap'],
+				$options['clean']['gap'],
+				$options['before'],
+				$options['clean']['word']
+			);
+			$str = preg_replace($kleenex, '', $str);
 		}
 		return $str;
 	}
diff --git a/cake/tests/cases/libs/string.test.php b/cake/tests/cases/libs/string.test.php
index 5f6e7db85..ecdf5ee21 100644
--- a/cake/tests/cases/libs/string.test.php
+++ b/cake/tests/cases/libs/string.test.php
@@ -115,6 +115,16 @@ class StringTest extends UnitTestCase {
 		$expected = '2 and 3';
 		$result = String::insert($string, array('b' => 2, 'c' => 3), array('clean' => true));
 		$this->assertEqual($result, $expected);
+
+		$string = '":a, :b and :c"';
+		$expected = '"1, 2"';
+		$result = String::insert($string, array('a' => 1, 'b' => 2), array('clean' => true));
+		$this->assertEqual($result, $expected);
+
+		$string = '":a, :b and :c"';
+		$expected = '"1, 2"';
+		$result = String::insert($string, array('a' => 1, 'b' => 2), array('clean' => true));
+		$this->assertEqual($result, $expected);
 	}
 	
 	function testTokenize() {