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Learn how to efficiently split a string into a list of sentences in Python while retaining the newline characters for better text formatting, especially when using libraries like moviepy.
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This video is based on the question https://stackoverflow.com/q/73329351/ asked by the user 'PyroManieAct' ( https://stackoverflow.com/u/18853878/ ) and on the answer https://stackoverflow.com/a/73329418/ provided by the user 'Allan Wind' ( https://stackoverflow.com/u/9706/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Split a String into Sentences Without Losing Newline Characters in Python

When working with text in Python, you may encounter a common problem: splitting a string into individual sentences while retaining the newline (\n) characters. This is particularly important when the newline serves as a vital formatting tool for certain applications, such as when using moviepy for video editing and text rendering.

In this guide, we'll explore a straightforward solution to this issue. We aim to maintain the integrity of the original text while effectively separating sentences.

The Problem

Imagine you have a block of text:

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You want to split this text into sentences:

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However, the initial approach you might use could strip away the newlines, which is not ideal for your application.

The Solution: Using Regular Expressions in Python

To achieve the desired outcome without losing the newline characters, we can utilize Python's re module. Specifically, we can enhance our regular expression to ensure that the newline characters are preserved during the split.

Step-by-Step Implementation

Import the required module:
Start by importing the re module, which provides support for regular expressions in Python.

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Define the input string:
You can define a string (text block) that you wish to split.

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Split the string using a specific pattern:
Use the re.split() function with a regular expression that captures both periods and newlines.

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Here, (?<=.) is a positive lookbehind assertion that matches any space or newline that follows a period. This approach effectively retains newline characters in the split output.

View the output:
Finally, print out the result to see the split sentences:

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Example Output

The output from running the above code would look like this:

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Notice how the newline character is preserved as intended.

Conclusion

By following the steps outlined above, you can easily split a string into sentences while keeping the newline characters in Python. This method is immensely useful for processing texts where formatting is crucial, especially when using third-party libraries such as moviepy.

Feel free to experiment with this solution in your projects and modify the regex pattern as necessary to suit different text structures you may encounter!