正则1

import re

line = "bobby123"

# 字符串以b开头，. 表示除换行的任意字符 *表个数
regex_str = "^b.*"

if re.match(regex_str,line):
    print("matched")

# 字符串以$结尾
regex_str = ".*3$"
if re.match(regex_str,line):
    print("matched")

# ？非贪婪模式，默认贪婪匹配（匹配满足要求的最大长度的字符串）
line = "bo00000000bbbbby123"
regex_str = ".*(b.*b).*"
match_obj = re.match(regex_str,line)

if match_obj:
    print(match_obj.group(1)) # bb
# 思考：为什么结果是bb呢？反向开始 匹配的

regex_str = ".*?(b.*?b).*"
match_obj = re.match(regex_str,line)

if match_obj:
    print(match_obj.group(1)) # bo00000000b