Скачать или смотреть Mastering sed: Partial Replacement of UTF-16 Decimal Characters in Files

Discover how to effectively use the `sed` command to partially replace UTF-16 decimal characters in text files, transforming your data with ease.
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Mastering sed: Partial Replacement of UTF-16 Decimal Characters in Files

When working with files containing UTF-16 decimal characters, you might find yourself needing to make specific replacements. In this guide, we’ll tackle a common problem involving the replacement of character patterns using the sed command in Linux. We will explore how to handle patterns like \u[0-9]+ ? and transform them into a more readable format—specifically, changing \u to UTF16- and modifying the ending ? to a pipe |.

The Problem

Suppose you have a text file that looks like this:

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

You want to achieve the following output:

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

What We Want to Accomplish

Our goal is to:

Replace occurrences of the pattern \u[0-9]+ ? with UTF16-[0-9]+ |

Specifically:

Change the initial \u to UTF16-

Change the terminating ? to a pipe |

However, we must keep in mind that any non-digit characters located between \u and ? should not be processed.

The Solution Using sed

Step-by-Step Breakdown

To achieve our goal, we will use the sed command, which is a powerful stream editor for filtering and transforming text. Here’s how to structure our approach:

Pattern Matching:

We need to find the specific pattern within our text. The regex pattern we’ll use is:

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

Breakdown:

\u matches the literal \u

([0-9]+ ) captures one or more digits (these will be used later)

? matches the literal question mark

Replacement:

Our replacement string will be structured as:

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

Breakdown:

UTF16- is the new prefix.

\1 references the group of digits that were captured.

| is added to denote the new format.

Command Execution

To perform the replacement in the file, execute the following command in your terminal:

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In Practice

Let’s see how the command works:

Before running the command:

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Output:

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After running the command:

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Output:

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

Conclusion

With this simple yet effective use of the sed command, you can transform specific patterns in your files quickly and efficiently. Remember that mastering tools like sed can significantly enhance your productivity when working with text data in Linux.

Happy coding, and may your search-and-replace tasks become effortless!