Скачать или смотреть How to Use PowerShell to Replace Strings in a Text File with Regex in CMD

Learn how to effectively use `PowerShell` commands to find and replace strings in a text file using regex, all from within a CMD (batch file)!
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This video is based on the question https://stackoverflow.com/q/64895340/ asked by the user 'morez890' ( https://stackoverflow.com/u/14640196/ ) and on the answer https://stackoverflow.com/a/64898792/ provided by the user 'lit' ( https://stackoverflow.com/u/447901/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Finding and Replacing Strings in a Text File Using PowerShell in CMD

If you've ever needed to manipulate text files using regex and PowerShell commands within CMD (or a batch file), you might find yourself facing a challenge when it comes to adding new lines in your output. In this guide, we'll walk through how to effectively perform string replacements in a text file by leveraging PowerShell while utilizing the powerful features of regex.

Understanding the Problem

The user has a text file with specific strings that need replacement. They wish to accomplish this task using a PowerShell command invoked from within a CMD session, but are struggling to incorporate new lines in the output. The original PowerShell command they used executes correctly, but fails to format the output as desired due to issues with line breaks.

Solution Overview

To replace strings in your text file successfully while incorporating new line characters, there are a few important adjustments to your initial approach. Here’s a step-by-step breakdown of how to execute it correctly:

Step 1: Setting Up Your Command

The first step is to format your PowerShell command properly. One notable change is that you need to ensure that you use quotation marks and avoid using the invocation operator (&). The new command will look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Explanation of Each Component

Get-ChildItem . \Test1.txt: This part retrieves the list of files in the current directory that match Test1.txt.

Get-Content: This command reads the content of the specified file.

Foreach-Object: This allows you to loop through each line of text in the file and apply transformations to it. In this case, we use a regex replacement.

-replace: This cmdlet allows you to define a pattern to search for within the text and replace it with something else. In this specific line, the target string is 'is', and it is replaced with the new string that includes a new line (wasrnwas).

Set-Content -encoding Default . \Test2.txt: This command writes the manipulated content to a new text file called Test2.txt, using the default encoding.

Step 3: Output Verification

Once your command executes, you can verify the results by checking the content of both Test1.txt and Test2.txt. For example:

[[See Video to Reveal this Text or Code Snippet]]

The expected output should show the original text alongside the modified version that now correctly includes new lines as specified.

Conclusion

By tweaking the structure of your PowerShell command and properly handling new line characters, you can seamlessly find and replace strings in your text files from within CMD. This approach not only improves your text processing tasks but also enhances your productivity when working with PowerShell scripts.

Feel free to adapt the regex patterns and commands as needed to suit your own text manipulation requirements. Happy scripting!