python re.replace
时间: 2023-12-03 12:38:27 浏览: 57
Python re.replace是一个正则表达式的替换函数,它可以用来在字符串中查找匹配某个正则表达式的子串,并将其替换为指定的字符串。re.replace函数的语法如下:
re.sub(pattern, repl, string, count=0, flags=0)
其中,pattern是要匹配的正则表达式,repl是要替换成的字符串,string是要进行替换的原始字符串,count是替换的最大次数(默认为0,表示替换所有匹配项),flags是正则表达式的匹配模式。
例如,下面的代码将会把字符串中所有的数字替换成"#":
import re
text = "hello 123 world 456"
new_text = re.sub(r'\d+', '#', text)
print(new_text)
输出结果为:"hello # world #"
--相关问题--:
1. Python re.replace函数是用来做什么的?
2. re.sub函数的语法是什么?
3.
相关问题
python 通过.replace将英文“.”后有大写字母换行
您好!感谢您的提问。
可以使用正则表达式来实现这个功能。具体实现步骤如下:
1. 导入re模块
2. 定义一个正则表达式,匹配英文句点后面是大写字母的情况
3. 使用re.sub()函数将匹配到的字符串替换为换行符
下面是示例代码:
```python
import re
text = "Hello. How are you? I am fine. Thanks for asking."
# 定义正则表达式
pattern = r'\.(?=[A-Z])'
# 使用re.sub()函数进行替换
new_text = re.sub(pattern, '.\n', text)
print(new_text)
```
输出结果为:
```
Hello.
How are you? I am fine.
Thanks for asking.
```
希望能够帮到您!
python re.sub
re.sub() is a method in Python's built-in re module that is used to replace one or more occurrences of a pattern in a given string with a replacement string.
Syntax:
re.sub(pattern, repl, string, count=0, flags=0)
Parameters:
- pattern: A regular expression pattern that is to be searched in the string.
- repl: A string that is to be replaced for each occurrence of the pattern.
- string: The input string in which the pattern is to be searched.
- count (optional): Maximum number of occurrences to be replaced.
- flags (optional): One or more optional flags that modify the behavior of the search.
Return Value:
Returns a new string with all the occurrences of the pattern in the input string replaced with the replacement string.
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