python re.match函数
时间: 2024-05-16 08:18:58 浏览: 273
Python中的re.match函数是正则表达式模块(re模块)中的一个函数,用于从字符串的起始位置开始匹配一个正则表达式。如果匹配成功,返回一个匹配对象(Match object),否则返回None。
下面是一个示例代码,展示了re.match函数的用法:
```
import re
s = "Long live the people's Republic of China"
ret1 = re.match('Long', s)
print(ret1)
ret2 = re.match('the', s)
print(ret2)
```
在这个示例中,我们使用re.match函数对字符串s进行匹配。ret1匹配成功,因为字符串s的起始位置是'Long',与正则表达式'Long'匹配。所以ret1是一个匹配对象。而ret2匹配失败,因为字符串s的起始位置不是'the',与正则表达式'the'不匹配。所以ret2是None。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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