fixed bug in operator matching function

test.js

@@ -97,6 +97,9 @@ function extendProp(pair) {
   return x.length + y.length === extended.length;
 }
 
+/* Tokenizer tests */
+
+
 function toolsTests() {
   assert.equal(true, tools.empty([]));
   assert.equal(true, qc.forAll(dictProp, arbArrayofPairs));

tools.js

@@ -1,5 +1,4 @@
 var _ = require("underscore");
-var example = require("./failing.js");
 
 function empty(xs) {
   return _.size(xs) < 1;
@@ -55,7 +54,7 @@ RegExp.escape= function(s) {
 function operatorMatch(ops) {
   ops = _.filter(ops,
                  function (op) {
-                   return op.replace(/ /g,'').length > 1;
+                   return op.length > 0;
                  });
   var rstring = ops.sort(min).reduce(
   function(acc, x) {