diff --git a/.travis.yml b/.travis.yml
index d888943..2245011 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
  language: node_js
  node_js:
-   - "0.8"
+   - "4.4.5"
  git:
    depth: 3
diff --git a/dev/src/pattern_lexer.js b/dev/src/pattern_lexer.js
index f6ad89c..cc00827 100644
--- a/dev/src/pattern_lexer.js
+++ b/dev/src/pattern_lexer.js
@@ -15,6 +15,27 @@
             //params - everything between `{ }` or `: :`
             PARAMS_REGEXP = /(?:\{|:)([^}:]+)(?:\}|:)/g,
 
+            fnReplaceOS = function(match, offset, string) {
+                var rsIndex = string.lastIndexOf("__CR_RS__"), //last index of required slash
+                    rqIndex = string.indexOf("__CR_RQ__"), //first index of required query
+                    oqIndex = string.indexOf("__CR_OQ__"), //first index of optional query
+                    slashIndex = string.indexOf("\\/", offset), //first index of char slash after the matched offset
+                    qIndex = Math.min(oqIndex === -1 ? string.length : oqIndex, rqIndex === -1 ? string.length : rqIndex),
+                    endPosition = offset + match.length;
+
+                if (endPosition >= qIndex || endPosition < rsIndex || endPosition < slashIndex) {
+                    //regex for optinal slash is returned when the optional slash:
+                    //1. immediately precedes a query (either optional or required) or appears after a query
+                    //2. appears before a required slash
+                    //3. appears before a slash char in the pattern
+                    return TOKENS.OS.res_normal;
+                } else {
+                    //otherwise the slash isn't fully optional and return the regex defined
+                    //for optional slash "after required slash or before query"
+                    return TOKENS.OS.res_arsbq;
+                }
+            },
+
             //used to save params during compile (avoid escaping things that
             //shouldn't be escaped).
             TOKENS = {
@@ -23,7 +44,15 @@
                     //slash between `::` or `}:` or `\w:` or `:{?` or `}{?` or `\w{?`
                     rgx : /([:}]|\w(?=\/))\/?(:|(?:\{\?))/g,
                     save : '$1{{id}}$2',
-                    res : '\\/?'
+                    res : fnReplaceOS,
+                    //the regex for optinal slash
+                    res_normal : '\\/?',
+                    //the regex for slash which isn't fully optional based on the given pattern
+                    //for example, given patterns foo/:bar: and foobar/:bar:, the slash isn't fully
+                    //optional because if the slash is optional, hash "foobar" will also match foo/:bar:
+                    //with parameter bar set to "bar"
+                    //arsbq stands for "after required slash or before query"
+                    res_arsbq : '(?:(?:\\/(?=(?:[^\\/?]+)?))|^\\/?|\\/?$)'
                 },
                 'RS' : {
                     //required slashes
@@ -238,4 +267,3 @@
         };
 
     }());
-
diff --git a/dev/tests/spec/match.spec.js b/dev/tests/spec/match.spec.js
index ee998bf..be8d5ca 100644
--- a/dev/tests/spec/match.spec.js
+++ b/dev/tests/spec/match.spec.js
@@ -89,6 +89,12 @@ describe('Match', function(){
         expect( d.match('/123/45/ipsum') ).toBe( true );
     });
 
+    it('should not take the slash as optional one', function(){
+        var s = crossroads.addRoute('/123/:bar:');
+        expect( s.match('/1234') ).toBe(false);
+        expect( s.match('/123/4') ).toBe(true);
+    });
+
     it('should support multiple consecutive optional params', function(){
         var s = crossroads.addRoute('/123/:bar:/:ipsum:');
         expect( s.match('/123') ).toBe( true );
diff --git a/dev/tests/spec/parse.spec.js b/dev/tests/spec/parse.spec.js
index 872065f..0aeced0 100644
--- a/dev/tests/spec/parse.spec.js
+++ b/dev/tests/spec/parse.spec.js
@@ -195,6 +195,23 @@ describe('crossroads.parse()', function(){
             expect( calls ).toBe( 1 );
         });
 
+        it('should capture optional params when option params in the front are omitted', function(){
+            var calls = 0;
+
+            var a = crossroads.addRoute('foo/:lorem:/:ipsum:/:dolor:/:sit:');
+            a.matched.add(function(a, b, c, d){
+                expect( a ).toBeUndefined();
+                expect( b ).toBe( '123' );
+                expect( c ).toBeUndefined();
+                expect( d ).toBeUndefined();
+                calls++;
+            });
+
+            crossroads.parse('foo//123');
+
+            expect( calls ).toBe( 1 );
+        })
+
     });