From 0b82e1cd5b29e348700472cc711020e477d5e81a Mon Sep 17 00:00:00 2001
From: Joao Carlos <mail@joao-carlos.com>
Date: Tue, 9 Jun 2015 15:14:41 +0300
Subject: [PATCH] Change --mangle-regex to accept a full regex

---
 README.md    |  2 +-
 bin/uglifyjs | 14 +++++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 073a8715..3b99441b 100644
--- a/README.md
+++ b/README.md
@@ -253,7 +253,7 @@ cover most standard JS and DOM properties defined in various browsers.  Pass
 `--reserve-domprops` to read that in.
 
 You can also use a regular expression to define which property names should be
-mangled.  For example, `--mangle-regex="^_"` will only mangle property names
+mangled.  For example, `--mangle-regex="/^_/"` will only mangle property names
 that start with an underscore.
 
 When you compress multiple files using this option, in order for them to
diff --git a/bin/uglifyjs b/bin/uglifyjs
index 9a1323fd..4768f766 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -192,6 +192,15 @@ function writeNameCache(key, cache) {
     return UglifyJS.writeNameCache(ARGS.name_cache, key, cache);
 }
 
+function extractRegex(str) {
+  if (/^\/.*\/[a-zA-Z]*$/.test(str)) {
+    var regex_pos = str.lastIndexOf("/");
+    return new RegExp(str.substr(1, regex_pos - 1), str.substr(regex_pos + 1));
+  } else {
+    throw new Error("Invalid regular expression: " + str);
+  }
+}
+
 if (ARGS.quotes === true) {
     ARGS.quotes = 3;
 }
@@ -218,9 +227,8 @@ if (BEAUTIFY)
 
 if (ARGS.comments != null) {
     if (/^\/.*\/[a-zA-Z]*$/.test(ARGS.comments)) {
-        var regex_pos = ARGS.comments.lastIndexOf("/");
         try {
-            OUTPUT_OPTIONS.comments = new RegExp(ARGS.comments.substr(1, regex_pos - 1), ARGS.comments.substr(regex_pos + 1));
+            OUTPUT_OPTIONS.comments = extractRegex(ARGS.comments);
         } catch (e) {
             print_error("ERROR: Invalid --comments: " + e.message);
         }
@@ -379,7 +387,7 @@ async.eachLimit(files, 1, function (file, cb) {
         var regex;
 
         try {
-          regex = ARGS.mangle_regex ? new RegExp(ARGS.mangle_regex) : null;
+          regex = ARGS.mangle_regex ? extractRegex(ARGS.mangle_regex) : null;
         } catch (e) {
             print_error("ERROR: Invalid --mangle-regex: " + e.message);
             process.exit(1);
-- 
2.34.1