ES6 unicode escapes, part 2: Regexps.

src/regexp.js

Index: src/regexp.js
diff --git a/src/regexp.js b/src/regexp.js
index e1eac76c124dbda3bc0635466617d1887fd17775..98d03946da9a5e1a33d759b9614cacc2eb243b7c 100644
--- a/src/regexp.js
+++ b/src/regexp.js
@@ -22,6 +22,8 @@ function DoConstructRegExp(object, pattern, flags) {
     flags = (pattern.global ? 'g' : '')
         + (pattern.ignoreCase ? 'i' : '')
         + (pattern.multiline ? 'm' : '');
+    if (harmony_unicode)
+        flags += (pattern.unicode ? 'u' : '');
     if (harmony_regexps)
         flags += (pattern.sticky ? 'y' : '');
     pattern = pattern.source;
@@ -235,6 +237,7 @@ function RegExpToString() {
   if (this.global) result += 'g';
   if (this.ignoreCase) result += 'i';
   if (this.multiline) result += 'm';
+  if (harmony_unicode && this.unicode) result += 'u';
   if (harmony_regexps && this.sticky) result += 'y';
   return result;
 }