don't close string from inside re.VERBOSE comment

some highlighters get confused :(

IPython/core/inputtransformer.py

@@ -272,7 +272,8 b' _help_end_re = re.compile(r"""(%{0,2}'
                               [a-zA-Z_*][\w*]*        # Variable name
                               (\.[a-zA-Z_*][\w*]*)*   # .etc.etc
                               )
-                              (\?\??)$                # ? or ??""",
+                              (\?\??)$                # ? or ??
+                              """,
                               re.VERBOSE)
 
 def has_comment(src):