import re

`import re` 是Python语言中的一个导入语句，它用于引入正则表达式模块（re）。正则表达式是一种强大的文本处理工具，可以用来匹配、查找、替换字符串中的模式。通过这个模块，你可以执行各种复杂的文本操作，比如搜索特定的字符组合、验证邮箱地址、提取URL等。Python内置的`re` 模块提供了一系列函数，如 `search()`、`match()`、`findall()` 等，用于实现正则表达式的功能。

相关问题

python import re

As an AI language model, I can explain to you what is the purpose of `import re` statement in Python programming.

In Python programming, `import re` statement is used to import the regular expression module, which provides various functions and methods for working with regular expressions.

Regular expression is a sequence of characters that define a search pattern. It is used to match and manipulate text. Python's `re` module provides powerful tools for working with regular expressions. It allows you to search, replace, split, and extract information from text based on a pattern.

Once you import the `re` module, you can use its various functions and methods to work with regular expressions in your Python program.

Here's an example of using the `re` module to search for a pattern in a string:

import re

text = "The quick brown fox jumps over the lazy dog"
pattern = "fox"

match_obj = re.search(pattern, text)

if match_obj:
    print("Match found:", match_obj.group())
else:
    print("Match not found")

In this example, we imported the `re` module and used its `search()` function to search for the pattern "fox" in the string "The quick brown fox jumps over the lazy dog". If the pattern is found, the program prints "Match found" along with the matched text. If the pattern is not found, the program prints "Match not found".

Python import re

The "re" module in Python stands for Regular Expression. It provides support for regular expressions in Python programming language. The module allows you to work with regular expressions in Python by providing various functions and methods.

Here are some common functions and methods of the "re" module:

1. re.compile(): This function is used to compile a regular expression pattern into a regular expression object.

2. re.search(): This method is used to search a string for a match to a regular expression pattern. It returns a match object if the pattern is found, otherwise it returns None.

3. re.findall(): This method is used to find all occurrences of a regular expression pattern in a string. It returns a list of strings that match the pattern.

4. re.sub(): This method is used to replace all occurrences of a regular expression pattern in a string with a new string.

5. re.split(): This method is used to split a string into a list of substrings using a regular expression pattern as the delimiter.

Overall, the "re" module is a powerful tool for working with regular expressions in Python programming language.