Fix minifier to distinguish regexps from divisions (to some extent).

tools/jsmin.py

 #!/usr/bin/python2.4
 
 # Copyright 2009 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 214 matching lines @@
       line = re.sub(r" +$", "", line)
       # A regexp that matches a literal string surrounded by "double quotes".
       # This regexp can handle embedded backslash-escaped characters including
       # embedded backslash-escaped double quotes.
       double_quoted_string = r'"(?:[^"\\]|\\.)*"'
       # A regexp that matches a literal string surrounded by 'double quotes'.
       single_quoted_string = r"'(?:[^'\\]|\\.)*'"
       # A regexp that matches a regexp literal surrounded by /slashes/.
       # Don't allow a regexp to have a ) before the first ( since that's a
       # syntax error and it's probably just two unrelated slashes.
-      slash_quoted_regexp = r"/(?:(?=\()|(?:[^()/\\]|\\.)+)(?:\([^/\\]|\\.)*/"
+      # Also don't allow it to come after anything that can only be the
+      # end of a primary expression.
+      slash_quoted_regexp = r"(?<![\w$'\")\]])/(?:(?=\()|(?:[^()/\\]|\\.)+)(?:\([^/\\]|\\.)*/"
       # Replace multiple spaces with a single space.
       line = re.sub("|".join([double_quoted_string,
                               single_quoted_string,
                               slash_quoted_regexp,
                               "( )+"]),
                     self.RemoveSpaces,
                     line)
       # Strip single spaces unless they have an identifier character both before
       # and after the space.  % and $ are counted as identifier characters.
       line = re.sub("|".join([double_quoted_string,
@@ skipping 25 matching lines @@
                               r"\{",                  # Curly braces.
                               r"\}",
                               r"\bvar [\w$%,]+",      # var declarations.
                               function_declaration_regexp,
                               variable_use_regexp]),
                     self.Declaration,
                     line)
       new_lines.append(line)
 
     return "\n".join(new_lines) + "\n"