Python re groups positive lookahead for absolute beginners
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sure! in python's re module, groups are portions of a regular expression enclosed in parentheses. they allow you to capture and extract specific parts of a matched string. positive lookahead is a type of assertion in regular expressions that specifies a pattern that must follow the main pattern without including it in the match.
here's a simple tutorial to demonstrate how to use groups and positive lookahead in python's re module:
1. import the re module:
2. define a regular expression pattern with a group and a positive lookahead:
in this pattern:
`(\w+)` captures one or more word characters.
`\s` matches a whitespace character.
`(?=\d)` is the positive lookahead assertion that checks if the next character is a digit.
3. create a sample text to search within:
4. use the re.findall() function to search for matches using the defined pattern:
5. print the matched groups:
when you run the code, it will output:
in this example, we captured words that are followed by a digit using a positive lookahead. the positive lookahead `(?=\d)` ensures that the match includes only words that are immediately followed by a digit without including the digit itself.
i hope this tutorial helps you understand how to use groups and positive lookahead in python's re module. let me know if you have any questions or need further clarification!
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