~~~python import re s = "154363" res = re.match("3", s) # 从头开始匹配 res2 = re.search("3", s) # 全局搜索 res3 = re.findall("3", s) # 全部取出 print(res) # None print(res2) # <re.Match object; span=(3, 4), match='3'> print(res3) # ['3', '3'] ~~~