python - django查询正则匹配

Question

    def get_queryset(self):
        #todo
        self.kw = self.request.GET.get('kw','').strip()
        no_q = Q()
        name_q = Q()
        style_q = Q()
        if self.kw:
            pattern = re.compile(r'[sedo]{1}[nasedm]{1}\d{8}\d{4}')
            if len(self.kw) == 14 and pattern.search(self.kw):
                #todo

1、上述代码里用关键词查询时正则匹配的规则是什么意思？

2、限定关键词长度为14？但实际查询时感觉没有限定啊

Answer 1

1+1+8+4=14
[sedo]{1} means that one of the four characters [sedo] appears once
[nasedm]{1} Same as above
d{8} means 8 [0- 9]The number
d{4} represents 4 [0-9] numbers
Please refer to: Regular expression