def PattenCut(patten:str, string:str, start:int=0, end:int=None)->iter:
""" 标准的字符截取器,返回一个迭代对象 """
pattenX = Compile(patten)
coincide = pattenX.finditer(string)
if coincide:
for i in coincide:
yield i.group()[start:end]
def PattenCut(patten, string, start=0, end=None) -> list:
""" 按照模式patten对目标字符串截取匹配部分coincidence,
返回coincidence[start:end],若没有匹配则返回None """
patten1 = Compile(patten)
coincide = patten1.finditer(string)
if coincide:
cc = []
for i in coincide:
cc.append(i.group()[start:end])
return cc
else:
raise PattenError()
