micropython findall
时间: 2023-09-12 18:12:39 浏览: 43
The `findall` method in MicroPython is a regular expression function that searches for all occurrences of a pattern in a given string and returns a list of all matches found.
Here's an example of using `findall` in MicroPython:
```python
import re
string = "The quick brown fox jumps over the lazy dog"
pattern = r"\w{4}"
matches = re.findall(pattern, string)
print(matches)
```
Output:
```
['quick', 'brown', 'jumps', 'over', 'lazy']
```
In this example, the `findall` method searches for all occurrences of a pattern consisting of four consecutive word characters (`\w{4}`) in the given string. The method returns a list of all matches found, which are then printed to the console.
相关问题
find findall
`find` and `findall` are functions commonly used in regular expressions. In Python, these functions are available in the `re` module.
The `find` function is used to search for a pattern in a string and returns the index of the first occurrence of the pattern. If the pattern is not found, it returns -1.
Example usage of `find`:
```python
import re
text = "Hello, World!"
pattern = "World"
index = re.find(pattern, text)
print(index) # output: 7
```
On the other hand, the `findall` function returns all non-overlapping occurrences of a pattern in a string as a list of strings.
Example usage of `findall`:
```python
import re
text = "Hello, World! How are you?"
pattern = "\w+"
matches = re.findall(pattern, text)
print(matches) # output: ['Hello', 'World', 'How', 'are', 'you']
```
In both cases, regular expressions are used to define the pattern to be searched for. Regular expressions provide a powerful and flexible way to match and manipulate strings.
Python findall
Python的`findall`是re模块中的一个函数,用于在字符串中查找所有匹配的子串,并返回一个列表。它的使用方法如下[^1]:
```python
import re
pattern = re.compile(正则规则)
result = pattern.findall(要匹配的字符串)
print(result)
```
其中,`正则规则`是一个正则表达式,用于指定要匹配的模式。`要匹配的字符串`是需要进行匹配的字符串。
`findall`函数会返回一个列表,列表中的每个元素都是匹配到的子串。如果没有匹配到任何子串,则返回一个空列表。
范例:假设我们要在字符串中查找所有的数字:
```python
import re
pattern = re.compile(r'\d+')
string = 'abc123def456ghi789'
result = pattern.findall(string)
print(result) # 输出:['123', '456', '789']
```
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)