SearchEngine.py 文件源码

def getprog(self):
        pat = self.getpat()
        if not pat:
            self.report_error(pat, "Empty regular expression")
            return None
        pat = self.getcookedpat()
        flags = 0
        if not self.iscase():
            flags = flags | re.IGNORECASE
        try:
            prog = re.compile(pat, flags)
        except re.error as what:
            try:
                msg, col = what
            except:
                msg = str(what)
                col = -1
            self.report_error(pat, msg, col)
            return None
        return prog