Workaround for regexp.exec() returning '' for unmatched captures on IE (see #24)

Author: ksperling

build/angular-ui-states.js

@@ -1,6 +1,6 @@
 /**
  * State-based routing for AngularJS
- * @version v0.0.1 - 2013-02-15
+ * @version v0.0.1 - 2013-02-17
  * @link 
  * @license MIT License, http://www.opensource.org/licenses/MIT
  */
@@ -147,6 +147,8 @@ function $StateProvider(   $urlRouterProvider,   $urlMatcherFactory) {
     // Derive parent state from a hierarchical name only if 'parent' is not explicitly defined.
     var parent = root;
     if (!isDefined(state.parent)) {
+      // regex matches any valid composite state name
+      // would match "contact.list" but not "contacts"
       var compositeName = /^(.+)\.[^.]+$/.exec(name);
       if (compositeName != null) {
         parent = findState(compositeName[1]);
@@ -572,11 +574,11 @@ function UrlMatcher(pattern) {
   // inside the regular expression. The placeholder regexp breaks down as follows:
   //    :(\w+)                    colon placeholder ($1)
   //    \{(\w+)(?:\:( ... ))?\}   curly brace placeholder ($2) with optional regexp ... ($3)
-  //    (?: ... | ... | ... )*    the regexp consists of any number of atoms, an atom being either
+  //    (?: ... | ... | ... )+    the regexp consists of any number of atoms, an atom being either
   //    [^{}\\]+                  - anything other than curly braces or backslash
   //    \\.                       - a backslash escape
   //    \{(?:[^{}\\]+|\\.)*\}     - a matched set of curly braces containing other atoms
-  var placeholder = /:(\w+)|\{(\w+)(?:\:((?:[^{}\\]+|\\.|\{(?:[^{}\\]+|\\.)*\})*))?\}/g,
+  var placeholder = /:(\w+)|\{(\w+)(?:\:((?:[^{}\\]+|\\.|\{(?:[^{}\\]+|\\.)*\})+))?\}/g,
       names = {}, compiled = '^', last = 0, m,
       segments = this.segments = [], 
       params = this.params = [];
@@ -598,8 +600,8 @@ function UrlMatcher(pattern) {
   // The number of segments is always 1 more than the number of parameters.
   var id, regexp, segment;
   while ((m = placeholder.exec(pattern))) {
-    id = (m[1] != null) ? m[1] : m[2];
-    regexp = (m[3] != null) ? m[3] : '[^/]*';
+    id = m[1] || m[2];
+    regexp = m[3] || '[^/]*';
     segment = pattern.substring(last, m.index);
     if (segment.indexOf('?') >= 0) break; // we're into the search part
     compiled += quoteRegExp(segment) + '(' + regexp + ')';