_LegalCharsPatt  = r"[\w\d!#%&'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\=]"

_WeekPatt = r"(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)"
_MonthPatt = r"(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)"

_DatePatt = r"(?:" + _WeekPatt + r",\ \d{2}-" + _MonthPatt + r"-\d{4}\ \d{2}:\d{2}:\d{2}\ GMT)"

_CookiePattern = re.compile(
    r"(?x)"                       # This is a Verbose pattern
    r"(?P<key>"                   # Start of group 'key'
    ""+ _LegalCharsPatt +"+?"     # Any word of at least one letter, nongreedy
    r")"                          # End of group 'key'
    r"\s*=\s*"                    # Equal Sign
    r"(?P<val>"                   # Start of group 'val'
    r'"(?:[^\\"]|\\.)*"'            # Any doublequoted string
    r"|"                            # or
    ""+ _DatePatt + ""              # A date as specified by Netscape spec
    r"|"                            # or
    ""+ _LegalCharsPatt +"*"        # Any word or empty string
    r")"                          # End of group 'val'
    r"\s*;?"                      # Probably ending in a semi-colon
    )