python五十七课——正则表达式（边界字符）

import re
print(re.search(r'^www','hahawww.baidu.comhehe'))
print(re.search(r'^haha','hahawww.baidu.comhehe'))
print(re.search(r'hehe$','hahawww.baidu.comhehe'))
print(re.search(r'com$','hahawww.baidu.comhehe'))

print(re.search(r'Awww','hahawww.baidu.comhehe'))
print(re.search(r'Ahaha','hahawww.baidu.comhehe'))
print(re.search(r'heheZ','hahawww.baidu.comhehe'))
print(re.search(r'comZ','hahawww.baidu.comhehe'))


print('验证匹配字符串首位字符的区别：')
str1='''
hank is a cool man
hank is a nice man
hank is a prefect man
'''

print(re.findall(r'hank',str1,flags=re.M))
print(re.findall(r'leo',str1,flags=re.M))
print(re.findall(r'man$',str1,flags=re.M))
print(re.findall(r'manZ',str1,flags=re.M))

print(re.search(r'ne','never'))
print(re.search(r'ne?','never'))
print(re.search(r'er?','never'))

print(re.search(r'erB','never'))
print(re.search(r'erB','nerver'))
print(re.search(r'erB','ernerver'))
print(re.search(r'Ber','ernerver'))