diff --git a/common/content/autocommands.js b/common/content/autocommands.js
index 6dfba95e..3c1a0ad6 100644
--- a/common/content/autocommands.js
+++ b/common/content/autocommands.js
@@ -86,7 +86,7 @@ const AutoCommands = Module("autocommands", {
                         +
                         template.map(items, function (item)
                             <tr>
-                                <td>&#xa0;{item.pattern.source}</td>
+                                <td>&#xa0;{util.regexpSource(item.pattern)}</td>
                                 <td>{item.command}</td>
                             </tr>))
                 }
@@ -114,7 +114,7 @@ const AutoCommands = Module("autocommands", {
         for (let [, autoCmd] in Iterator(autoCmds)) {
             if (autoCmd.pattern.test(url) ^ !autoCmd.pattern.result) {
                 if (!lastPattern || lastPattern.source != autoCmd.pattern.source)
-                    dactyl.echomsg("Executing " + event + " Auto commands for " + autoCmd.pattern.source.quote(), 8);
+                    dactyl.echomsg("Executing " + event + " Auto commands for " + util.regexpSource(autoCmd.pattern).quote(), 8);
 
                 lastPattern = autoCmd.pattern;
                 dactyl.echomsg("autocommand " + autoCmd.command, 9);
diff --git a/common/content/options.js b/common/content/options.js
index d682c787..48a5ab23 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -391,7 +391,7 @@ const Option = Class("Option", {
         re.toString = function () Option.unparseRegexp(this);
         return re;
     },
-    unparseRegexp: function (re) re.bang + Option.quote(re.source.replace(/\\(.)/g, function (m, n1) n1 == "/" ? n1 : m), /^!|:/) +
+    unparseRegexp: function (re) re.bang + Option.quote(util.regexpSource(re), /^!|:/) +
         (typeof re.result === "boolean" ? "" : ":" + Option.quote(re.result)),
 
     getKey: {
diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 7f427d21..e0b58b5f 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -836,6 +836,14 @@ const Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
         return RegExp(expr, flags);
     },
 
+    /**
+     * Given a RegExp, returns its source in the form showable to the user.
+     *
+     * @param {RegExp} re The regexp showable source of which is to be returned.
+     * @returns {string}
+     */
+    regexpSource: function regexpSource(re) re.source.replace(/\\(.)/g, function (m0, m1) m1 === "/" ? "/" : m0),
+
     maxErrors: 15,
     errors: Class.memoize(function () []),
     reportError: function (error) {