Added escaping of forward slashes, these were introduced in Solr 4 regex support.

library/Solarium/Core/Query/Helper.php

@@ -103,7 +103,7 @@ class Helper
      */
     public function escapeTerm($input)
     {
-        $pattern = '/(\+|-|&&|\|\||!|\(|\)|\{|}|\[|]|\^|"|~|\*|\?|:|\\\)/';
+        $pattern = '/(\+|-|&&|\|\||!|\(|\)|\{|}|\[|]|\^|"|~|\*|\?|:|\/|\\\)/';
 
         return preg_replace($pattern, '\\\$1', $input);
     }

tests/Solarium/Tests/Core/Query/HelperTest.php

@@ -207,8 +207,8 @@ class HelperTest extends \PHPUnit_Framework_TestCase
     public function testEscapeTerm()
     {
         $this->assertEquals(
-            'a\\+b',
-            $this->helper->escapeTerm('a+b')
+            'a\\+b\/c',
+            $this->helper->escapeTerm('a+b/c')
         );
     }