From 8d9f1e74778f4035095f60af2b45aa4307b772df Mon Sep 17 00:00:00 2001
From: Astrid Elocson <aelocson@gmail.com>
Date: Fri, 23 Jan 2015 14:32:57 +0000
Subject: [PATCH] Catch syntax errors in regexp filters

---
 core/modules/filters/regexp.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/core/modules/filters/regexp.js b/core/modules/filters/regexp.js
index d6ab27303..4f8d9a8ee 100644
--- a/core/modules/filters/regexp.js
+++ b/core/modules/filters/regexp.js
@@ -41,7 +41,11 @@ exports.regexp = function(source,operator,options) {
 			regexpString = regexpString.substr(0,regexpString.length - match[0].length);
 		}
 	}
-	regexp = new RegExp(regexpString,flags);
+	try {
+		regexp = new RegExp(regexpString,flags);
+	} catch(e) {
+		return ["" + e];
+	}
 	// Process the incoming tiddlers
 	if(operator.prefix === "!") {
 		source(function(tiddler,title) {