diff --git a/docs/_userdoc/index.txt b/docs/_userdoc/index.txt
index 393ed0d..9443ff8 100644
--- a/docs/_userdoc/index.txt
+++ b/docs/_userdoc/index.txt
@@ -132,37 +132,34 @@ which looks like this:
     pattern = (
         r'([^\047"/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]'
         r'|\r?\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]'
-        r'|\r?\n|\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|((?:/\*![^*]*\*'
-        r'+(?:[^/*][^*]*\*+)*/)[^\047"/\000-\040]*)|(?<=[(,=:\[!&|?{};\r'
-        r'\n])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*'
+        r'|\r?\n|\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|(?<=[(,=:\[!&|?'
+        r'{};\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*'
         r'][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\0'
-        r'14\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/('
-        r'?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:'
-        r'\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\01'
-        r'3\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?'
-        r':(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*('
-        r'?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|'
-        r'}-]))?|(?<=[\000-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\0'
-        r'14\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?'
-        r'://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-        r')[^*]*\*+(?:[^/*][^*]*\*+)*/)))*((?:/(?![\r\n/*])[^/\\\[\r\n]*'
-        r'(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\])'
-        r')[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-        r')[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:'
-        r'[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*'
-        r'\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\000-!#%&(*,'
-        r'./:-@\[\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*'
-        r']*\*+(?:[^/*][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:['
-        r'\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*'
-        r'+)*/))*)+(?=[^\000-\040"#%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#'
-        r'%-,./:-@\[-^`{-~-])((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-        r')[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^\000-#%-,./:-@\[-^`{-~-])'
-        r'|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?'
-        r':[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\013\014\016-'
-        r'\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\000'
-        r'-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/'
-        r'))+|(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040'
-        r']|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+'
+        r'14\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/(?![\r'
+        r'\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r'
+        r'\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014'
+        r'\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r'
+        r'\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:'
+        r'[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[\00'
+        r'0-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\014\016-\040]|(?'
+        r':/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*((?:/(?![\r\n/*])[^/\\\[\r\n'
+        r']*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*'
+        r'\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014\016-\040]|(?:/\*['
+        r'^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:['
+        r'\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)'
+        r')*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\000-!#%&(*,./:-@\['
+        r'\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*'
+        r'][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013'
+        r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000'
+        r'-\040"#%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-]'
+        r')((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*'
+        r'\*+)*/)))+(?=[^\000-#%-,./:-@\[-^`{-~-])|(?<=\+)((?:[\000-\011'
+        r'\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)'
+        r'|(?<=-)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*]'
+        r'[^*]*\*+)*/)))+(?=-)|(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
+        r']*\*+(?:[^/*][^*]*\*+)*/))+|(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\0'
+        r'00-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*'
+        r')+'
     )
 
 
diff --git a/rjsmin.py b/rjsmin.py
index 4509253..d167015 100755
--- a/rjsmin.py
+++ b/rjsmin.py
@@ -120,7 +120,6 @@ def _make_jsmin(python_only=False):
         nospecial, charclass, nospecial
     )
     space = r'(?:%s|%s)' % (space_chars, space_comment)
-    space_nobang = r'(?:%s|%s)' % (space_chars, space_comment_nobang)
     newline = r'(?:%s?[\r\n])' % line_comment
 
     def fix_charclass(result):
@@ -200,7 +199,7 @@ def _make_jsmin(python_only=False):
             r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 3
                 r'(?=%(post_regex_off)s))?'
         r'|(?<=%(preregex2)s)'
-            r'%(space)s*(?:%(newline)s%(space)s)*'
+            r'%(space)s*'
             r'(%(regex)s)'                                     # 4
             r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 5
                 r'(?=%(post_regex_off)s))?'
@@ -245,29 +244,38 @@ def _make_jsmin(python_only=False):
 
         r'(%(dull)s+)'                                         # 0
         r'|(%(strings)s%(dull)s*)'                             # 1
-        r'|(%(bang_comment)s%(dull)s*)'                        # 2
         r'|(?<=%(preregex1)s)'
-            r'%(space)s*(?:%(newline)s%(space)s*)*'
+            r'(%(space)s*(?:%(newline)s%(space)s*)*)'          # 2
             r'(%(regex)s)'                                     # 3
             r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 4
                 r'(?=%(post_regex_off)s))?'
         r'|(?<=%(preregex2)s)'
-            r'%(space)s*(?:%(newline)s%(space)s)*'
-            r'(%(regex)s)'                                     # 5
-            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 6
+            r'(%(space)s*)'                                    # 5
+            r'(%(regex)s)'                                     # 6
+            r'(%(space)s*(?:%(newline)s%(space)s*)+'           # 7
                 r'(?=%(post_regex_off)s))?'
         r'|(?<=%(id_literal_close)s)'
-            r'%(space)s*(?:(%(newline)s)%(space)s*)+'          # 7
+            r'(%(space)s*(?:%(newline)s%(space)s*)+)'          # 8
             r'(?=%(id_literal_open)s)'
-        r'|(?<=%(id_literal)s)(%(space)s)+(?=%(id_literal)s)'  # 8
-        r'|(?<=\+)(%(space)s)+(?=\+)'                          # 9
-        r'|(?<=-)(%(space)s)+(?=-)'                            # 10
-        r'|%(space)s+'
-        r'|(?:%(newline)s%(space)s*)+'
-    ) % dict(locals(), space=space_nobang)).sub
+        r'|(?<=%(id_literal)s)(%(space)s+)(?=%(id_literal)s)'  # 9
+        r'|(?<=\+)(%(space)s+)(?=\+)'                          # 10
+        r'|(?<=-)(%(space)s+)(?=-)'                            # 11
+        r'|(%(space)s+)'                                       # 12
+        r'|((?:%(newline)s%(space)s*)+)'                       # 13
+    ) % locals()).sub
 
     # print space_sub_banged.__self__.pattern
 
+    keep = _re.compile((
+        # noqa pylint: disable = C0330
+
+        r'%(space_chars)s+|%(space_comment_nobang)s+|%(newline)s+'
+        r'|(%(bang_comment)s+)'
+    ) % locals()).sub
+    keeper = lambda m: m.groups()[0] or ''
+
+    # print keep.__self__.pattern
+
     def space_subber_banged(match):
         """ Substitution callback """
         # pylint: disable = R0911
@@ -277,22 +285,26 @@ def _make_jsmin(python_only=False):
             return groups[0]
         elif groups[1]:
             return groups[1]
-        elif groups[2]:
-            return groups[2]
         elif groups[3]:
-            if groups[4]:
-                return groups[3] + '\n'
-            return groups[3]
-        elif groups[5]:
-            if groups[6]:
-                return groups[5] + '\n'
-            return groups[5]
-        elif groups[7]:
-            return '\n'
-        elif groups[8] or groups[9] or groups[10]:
-            return ' '
+            return "%s%s%s%s" % (
+                keep(keeper, groups[2]),
+                groups[3],
+                keep(keeper, groups[4] or ''),
+                groups[4] and '\n' or '',
+            )
+        elif groups[6]:
+            return "%s%s%s%s" % (
+                keep(keeper, groups[5]),
+                groups[6],
+                keep(keeper, groups[7] or ''),
+                groups[7] and '\n' or '',
+            )
+        elif groups[8]:
+            return keep(keeper, groups[8]) + '\n'
+        elif groups[9] or groups[10] or groups[11]:
+            return keep(keeper, groups[9] or groups[10] or groups[11]) or ' '
         else:
-            return ''
+            return keep(keeper, groups[12] or groups[13])
 
     def jsmin(script, keep_bang_comments=False):  # pylint: disable = W0621
         r"""
@@ -368,25 +380,24 @@ def jsmin_for_posers(script, keep_bang_comments=False):
             r'\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:'
             r'[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[\00'
             r'0-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\014\016-\040]|(?'
-            r':/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])'
-            r'(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+'
-            r')*/)))*((?:/(?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^'
-            r'\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:'
-            r'[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/'
-            r'))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]'
-            r'|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?'
-            r'\]|}-]))?|(?<=[^\000-!#%&(*,./:-@\[\\^`{|~])(?:[\000-\011\013'
-            r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:((?:(?:/'
-            r'/[^\r\n]*)?[\r\n]))(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*'
-            r'\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040"#%-\047)*,./:-@\\-^`'
-            r'|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-])((?:[\000-\011\013\014\01'
-            r'6-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^\000-#%-,./:'
-            r'-@\[-^`{-~-])|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*[^'
-            r'*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\013\0'
-            r'14\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\0'
-            r'00-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+'
-            r'|(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|('
-            r'?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+'
+            r':/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*((?:/(?![\r\n/*])[^/\\\[\r\n'
+            r']*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*'
+            r'\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014\016-\040]|(?:/\*['
+            r'^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:['
+            r'\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)'
+            r')*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\000-!#%&(*,./:-@\['
+            r'\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*'
+            r'][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:[\000-\011\013'
+            r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000'
+            r'-\040"#%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#%-,./:-@\[-^`{-~-]'
+            r')((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*'
+            r'\*+)*/)))+(?=[^\000-#%-,./:-@\[-^`{-~-])|(?<=\+)((?:[\000-\011'
+            r'\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=\+)'
+            r'|(?<=-)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*]'
+            r'[^*]*\*+)*/)))+(?=-)|(?:[\000-\011\013\014\016-\040]|(?:/\*[^*'
+            r']*\*+(?:[^/*][^*]*\*+)*/))+|(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\0'
+            r'00-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*'
+            r')+'
         )
 
         def subber(match):
@@ -409,55 +420,66 @@ def jsmin_for_posers(script, keep_bang_comments=False):
         rex = (
             r'([^\047"/\000-\040]+)|((?:(?:\047[^\047\\\r\n]*(?:\\(?:[^\r\n]'
             r'|\r?\n|\r)[^\047\\\r\n]*)*\047)|(?:"[^"\\\r\n]*(?:\\(?:[^\r\n]'
-            r'|\r?\n|\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|((?:/\*![^*]*\*'
-            r'+(?:[^/*][^*]*\*+)*/)[^\047"/\000-\040]*)|(?<=[(,=:\[!&|?{};\r'
-            r'\n])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*'
-            r'][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\0'
-            r'14\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*((?:/('
-            r'?![\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:'
-            r'\\[^\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\01'
-            r'3\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?'
-            r':(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*('
-            r'?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|'
-            r'}-]))?|(?<=[\000-#%-,./:-@\[-^`{-~-]return)(?:[\000-\011\013\0'
-            r'14\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?'
-            r'://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-            r')[^*]*\*+(?:[^/*][^*]*\*+)*/)))*((?:/(?![\r\n/*])[^/\\\[\r\n]*'
-            r'(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]\r\n]*)*\])'
-            r')[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-            r')[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:'
-            r'[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*'
-            r'\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\000-!#%&(*,'
-            r'./:-@\[\\^`{|~])(?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*'
-            r']*\*+(?:[^/*][^*]*\*+)*/))*(?:((?:(?://[^\r\n]*)?[\r\n]))(?:['
-            r'\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*'
-            r'+)*/))*)+(?=[^\000-\040"#%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#'
-            r'%-,./:-@\[-^`{-~-])((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!'
-            r')[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=[^\000-#%-,./:-@\[-^`{-~-])'
-            r'|(?<=\+)((?:[\000-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?'
-            r':[^/*][^*]*\*+)*/)))+(?=\+)|(?<=-)((?:[\000-\011\013\014\016-'
-            r'\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/)))+(?=-)|(?:[\000'
-            r'-\011\013\014\016-\040]|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/'
-            r'))+|(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040'
-            r']|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+'
+            r'|\r?\n|\r)[^"\\\r\n]*)*"))[^\047"/\000-\040]*)|(?<=[(,=:\[!&|?'
+            r'{};\r\n])((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/'
+            r'*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-\011\013'
+            r'\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)*)((?:/(?!'
+            r'[\r\n/*])[^/\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^'
+            r'\r\n][^\\\]\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\013\01'
+            r'4\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^'
+            r'\r\n]*)?[\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+('
+            r'?:[^/*][^*]*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=['
+            r'\000-#%-,./:-@\[-^`{-~-]return)((?:[\000-\011\013\014\016-\040'
+            r']|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)((?:/(?![\r\n/*])[^/'
+            r'\\\[\r\n]*(?:(?:\\[^\r\n]|(?:\[[^\\\]\r\n]*(?:\\[^\r\n][^\\\]'
+            r'\r\n]*)*\]))[^/\\\[\r\n]*)*/))((?:[\000-\011\013\014\016-\040]'
+            r'|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r'
+            r'\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]'
+            r'*\*+)*/))*)+(?=[^\000-\040&)+,.:;=?\]|}-]))?|(?<=[^\000-!#%&(*'
+            r',./:-@\[\\^`{|~])((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*'
+            r'\*+(?:[^/*][^*]*\*+)*/))*(?:(?:(?://[^\r\n]*)?[\r\n])(?:[\000-'
+            r'\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))*)+)'
+            r'(?=[^\000-\040"#%-\047)*,./:-@\\-^`|-~])|(?<=[^\000-#%-,./:-@'
+            r'\[-^`{-~-])((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:['
+            r'^/*][^*]*\*+)*/))+)(?=[^\000-#%-,./:-@\[-^`{-~-])|(?<=\+)((?:['
+            r'\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)'
+            r')+)(?=\+)|(?<=-)((?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*'
+            r'+(?:[^/*][^*]*\*+)*/))+)(?=-)|((?:[\000-\011\013\014\016-\040]'
+            r'|(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/))+)|((?:(?:(?://[^\r\n]*)?['
+            r'\r\n])(?:[\000-\011\013\014\016-\040]|(?:/\*[^*]*\*+(?:[^/*][^'
+            r'*]*\*+)*/))*)+)'
         )
 
+        keep = _re.compile((
+            r'[\000-\011\013\014\016-\040]+|(?:/\*(?!!)[^*]*\*+(?:[^/*][^*]*'
+            r'\*+)*/)+|(?:(?://[^\r\n]*)?[\r\n])+|((?:/\*![^*]*\*+(?:[^/*][^'
+            r'*]*\*+)*/)+)'
+        ) % locals()).sub
+        keeper = lambda m: m.groups()[0] or ''
+
         def subber(match):
             """ Substitution callback """
             groups = match.groups()
             return (
                 groups[0] or
                 groups[1] or
-                groups[2] or
-                (groups[4] and (groups[3] + '\n')) or
-                groups[3] or
-                (groups[6] and (groups[5] + '\n')) or
-                groups[5] or
-                (groups[7] and '\n') or
-                (groups[8] and ' ') or
-                (groups[9] and ' ') or
-                (groups[10] and ' ') or
-                ''
+                (groups[3] and "%s%s%s%s" % (
+                    keep(keeper, groups[2]),
+                    groups[3],
+                    keep(keeper, groups[4] or ''),
+                    groups[4] and '\n' or '',
+                )) or
+                (groups[6] and "%s%s%s%s" % (
+                    keep(keeper, groups[5]),
+                    groups[6],
+                    keep(keeper, groups[7] or ''),
+                    groups[7] and '\n' or '',
+                )) or
+                (groups[8] and keep(keeper, groups[8] + '\n')) or
+                (groups[9] and keep(keeper, groups[9]) or ' ') or
+                (groups[10] and keep(keeper, groups[10]) or ' ') or
+                (groups[11] and keep(keeper, groups[11]) or ' ') or
+                keep(keeper, groups[12] or groups[13])
             )
 
     return _re.sub(rex, subber, '\n%s\n' % script).strip()