Index: src/java/org/apache/lucene/queryParser/QueryParser.java
===================================================================
--- src/java/org/apache/lucene/queryParser/QueryParser.java	(revision 539509)
+++ src/java/org/apache/lucene/queryParser/QueryParser.java	(working copy)
@@ -803,7 +803,7 @@
       // These characters are part of the query syntax and must be escaped
       if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')' || c == ':'
         || c == '^' || c == '[' || c == ']' || c == '\"' || c == '{' || c == '}' || c == '~'
-        || c == '*' || c == '?') {
+        || c == '*' || c == '?' || c == '|' || c == '&') {
         sb.append('\\');
       }
       sb.append(c);
Index: src/java/org/apache/lucene/queryParser/QueryParser.jj
===================================================================
--- src/java/org/apache/lucene/queryParser/QueryParser.jj	(revision 539509)
+++ src/java/org/apache/lucene/queryParser/QueryParser.jj	(working copy)
@@ -827,7 +827,7 @@
       // These characters are part of the query syntax and must be escaped
       if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')' || c == ':'
         || c == '^' || c == '[' || c == ']' || c == '\"' || c == '{' || c == '}' || c == '~'
-        || c == '*' || c == '?') {
+        || c == '*' || c == '?' || c == '|' || c == '&') {
         sb.append('\\');
       }
       sb.append(c);
Index: src/test/org/apache/lucene/queryParser/TestQueryParser.java
===================================================================
--- src/test/org/apache/lucene/queryParser/TestQueryParser.java	(revision 539509)
+++ src/test/org/apache/lucene/queryParser/TestQueryParser.java	(working copy)
@@ -616,6 +616,10 @@
     assertEscapedQueryEquals("[ a - TO a+ ]", null, "\\[ a \\- TO a\\+ \\]");
     assertEscapedQueryEquals("[ a : TO a~ ]", null, "\\[ a \\: TO a\\~ \\]");
     assertEscapedQueryEquals("[ a\\ TO a* ]", null, "\\[ a\\\\ TO a\\* \\]");
+    
+    // LUCENE-881
+    assertEscapedQueryEquals("|| abc ||", a, "\\|\\| abc \\|\\|");
+    assertEscapedQueryEquals("&& abc &&", a, "\\&\\& abc \\&\\&");
   }
   
   public void testTabNewlineCarriageReturn()