add regexp support for custom pages

gruntfile.js

@@ -14,7 +14,9 @@ module.exports = function(grunt) {
                 //proxy           : "http://someurl.com"
                 openBrowser     : true,
                 customPages: {
-                    "/custom": "README.md"
+                    "/custom": "README.md",
+                    "/^\/foo/(\\w+)$/": "README.md",
+                    "/baz/quux": "LICENCE"
                 }
             }
         }

tasks/libs/CustomPagesMiddleware.js

@@ -16,14 +16,43 @@ var _ = require("lodash"),
  *
  */
 var CustomPagesMiddleware = function(basePath, rules){
-
     basePath = Divhide.Safe.string(basePath);
     rules = Divhide.Safe.object(rules);
 
+    // workaround for https://github.com/divhide/node-divhide/issues/39
+    var RegExpFormat = /^\/.*\/([gimuy]*)$/;
+    var isRegExpStr = function (value){
+        if(!Divhide.Type.isString(value)){
+            return false;
+        }
+
+        return !!RegExpFormat.exec(value);
+    };
+
+    var reducer = function(acc, regExpStr){
+        var re = Divhide.Safe.regexp(regExpStr);
+        var match = Divhide.Safe.string(rules[regExpStr]);
+        acc.push([re, match]);
+        return acc;
+    };
+    var regexpRules = Object.keys(rules)
+        .filter(isRegExpStr)
+        .reduce(reducer, []);
+
     return function(req, res){
         var url = req.url;
         var relFilePath = Divhide.Safe.string(rules[url]);
 
+        // check for possible string regexp
+        if(!relFilePath){
+            for(var i = 0, l = regexpRules.length; i < l; i++){
+                if(regexpRules[i][0].test(url)){
+                    relFilePath = regexpRules[i][1];
+                    break;
+                }
+            }
+        }
+
         // ignore if no rule is defined
         if(!relFilePath){
             res.emit("next");