python正则式实例

Python正则表达式是处置文本处理任务中不可或缺的手段，能够轻易地从大量的文本中查找，对应和获取特定的信息。下面我们来看一些Python正则表达式的例子。

import re
#字符串对应
string = "Python is a great programming language"
match = re.match(r'Python', string)
if match:
print("Match found!")
else:
print("Match not found!")
#字符串查找
string = "Bonjour, comment vas-tu?"
match = re.search(r'comment', string)
if match:
print("Match found at", match.start(), "to", match.end())
else:
print("Match not found!")
#替换字符串
string = "I love Python"
new_string = re.sub(r'Python', 'Java', string)
print(new_string)
#用group()方法获取对应对象
string = "john@example.com"
match = re.search(r'(\w+)@(\w+)', string)
if match:
print(match.group())
print(match.group(1))
print(match.group(2))
#查找所有对应项
string = "Python is a great programming language, Python is used by many developers"
matches = re.findall(r'Python', string)
print(matches)

以上是几个基本的Python正则表达式例子，在实际工作中，我们可以根据需要不断优化并扩展这些例子。