From 681fd2f6b41a3675d7b3113357e2cb3294413e7f Mon Sep 17 00:00:00 2001
From: joaoafrmartins <joaoafrmartins@gmail.com>
Date: Fri, 10 Jan 2014 00:17:52 +0000
Subject: [PATCH] added regexp filtering to nconf env store

---
 lib/nconf/stores/env.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/nconf/stores/env.js b/lib/nconf/stores/env.js
index e73026e..b3227c7 100644
--- a/lib/nconf/stores/env.js
+++ b/lib/nconf/stores/env.js
@@ -21,6 +21,7 @@ var Env = exports.Env = function (options) {
   options        = options || {};
   this.type      = 'env';
   this.readOnly  = true;
+  this.match = options.match
   this.whitelist = options.whitelist || [];
   this.separator = options.separator || '';
   if (options instanceof Array) {
@@ -52,7 +53,11 @@ Env.prototype.loadEnv = function () {
 
   this.readOnly = false;
   Object.keys(process.env).filter(function (key) {
-    return !self.whitelist.length || self.whitelist.indexOf(key) !== -1;
+    if(self.match) {
+      return key.match(self.match)
+    } else {
+      return !self.whitelist.length || self.whitelist.indexOf(key) !== -1
+    }
   }).forEach(function (key) {
     if (self.separator) {
       self.set(common.key.apply(common, key.split(self.separator)), process.env[key]);