Add a comment describing the purpose of the regexes.

Author: gpshead

Lib/email/utils.py

@@ -45,6 +45,8 @@
 CRLF = '\r\n'
 TICK = "'"
 
+# These are used by formataddr() to understand what characters require a name
+# field to be quoted and what characters within that must be \escaped.
 specialsre = re.compile(r'[][\\()<>@,:;". ]')
 escapesre = re.compile(r'[\\"]')