为什么不能用re？
不用re的话，可以用in来判断，代码如下：
testString = "hjkhks131fdsaf23413fasd123fafd123a1f3das1fasf1as1fa3f"
numberList = []
for _ in testString:
if _ in ["1","2","3","4","5","6","7","8","9","0"]:
print("当前字符是数字："+_)
numberList.append(_)
print(numberList)
运行效果见截图：
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