From a03b4e4dd43f57bc5209ccbf3e65f545f44e76c7 Mon Sep 17 00:00:00 2001
From: Frank van de Pol <fvdpol@gmail.com>
Date: Sun, 22 Dec 2013 17:46:25 +0100
Subject: [PATCH] Added validation logic to Change editor for validity of
 regular expressions

This change adds input validation to the gui of Change Nodes to prevent
the user from unintentionally entering an invalid regular expression.
The user will be notified on the specific error code to help resolve
the issue.
---
 nodes/core/logic/15-change.html | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/nodes/core/logic/15-change.html b/nodes/core/logic/15-change.html
index ea360908f..b1ad880d8 100644
--- a/nodes/core/logic/15-change.html
+++ b/nodes/core/logic/15-change.html
@@ -56,7 +56,18 @@
         defaults: {
             action: {value:"change",required:true},
             property: {value:"payload"},
-            from: {value:""},
+            from: {value:"",validate: function(v) {
+		        if (this.action == "change") {
+					try {
+		            	var re = new RegExp(this.from, "g");
+						return true;
+		            } catch(err) {
+						RED.notify("<strong>Error</strong>: "+err.message,"error");
+						return false;
+		            }
+		        } 
+		        return true;		        	
+			}},
             to: {value:""},
             name: {value:""}
         },