code: def _partialParseWeekday(self, s, sourceTime):
          
          parseStr = None
          chunk1 = chunk2 = ''
  
          ctx = self.currentContext
          log.debug('eval %s with context - %s, %s', s, ctx.hasDate, ctx.hasTime)
  
          # Weekday
          m = self.ptc.CRE_WEEKDAY.search(s)
          if m is not None:
              gv = m.group()
              if s not in self.ptc.dayOffsets:
  
                  if (gv != s):
                      # capture remaining string
                      parseStr = gv
                      chunk1 = s[:m.start()]
                      chunk2 = s[m.end():]
                      s = '%s %s' % (chunk1, chunk2)
                  else:
                      parseStr = s
                      s = ''
  
          if parseStr and not ctx.hasDate:
              debug and log.debug(
                  'found (weekday) [%s][%s][%s]', parseStr, chunk1, chunk2)
              sourceTime = self._evalWeekday(parseStr, sourceTime)
  
          return s, sourceTime, bool(parseStr)
docs: test if giving C{s} matched CRE_WEEKDAY, used by L{parse()}
  
          @type  s:          string
          @param s:          date/time text to evaluate
          @type  sourceTime: struct_time
          @param sourceTime: C{struct_time} value to use as the base
  
          @rtype:  tuple
          @return: tuple of remained date/time text, datetime object and
                   an boolean value to describ if matched or not