メモ帳のテキスト文字列のすべての発生を交換するにはどうすればよいですか？

To replace all occurrences of a text string in Notepad, use the built-in Find and Replace feature by pressing Ctrl + H, entering the text to find and replace in their respective fields, then clicking Replace All; for case-insensitive or regex-based replacements, use Notepad++. 1. Press Ctrl + H to open the Replace window. 2. Enter the text to find in the "Find what" field. 3. Input the replacement text in the "Replace with" field. 4. Click Replace All to change every instance at once. 5. For case-insensitive searches or regex support, switch to Notepad++, where you can check “Match using Regular Expression” and use advanced patterns like \d to replace digits. Standard Notepad is suitable for basic replacements but lacks advanced options available in Notepad++.

To replace all occurrences of a text string in Notepad, you can use the built-in Find and Replace feature. It's a straightforward process, but knowing the right steps helps avoid mistakes.

Use the Replace Function

Notepad has a simple yet effective Replace function that lets you swap one string for another across the entire document. Here's how to do it:

• Press Ctrl + H to open the Replace window.
• In the "Find what" field, type the text you want to replace.
• In the "Replace with" field, enter the new text.
• Click Replace All to change every instance at once.

This is especially useful when editing logs, code snippets, or any repetitive text where consistency matters.

Pro tip: If you're unsure, click Find Next a few times first to see exactly what will be replaced before doing a full Replace All.

Be Aware of Case Sensitivity

By default, Notepad’s Replace function is case-sensitive. That means "Hello" and "hello" are treated as different strings. Keep this in mind when doing replacements in documents with mixed casing.

If you need a case-insensitive search:

• You can't do that directly in standard Notepad.
• Consider using Notepad++ (a free enhanced version) which supports case-insensitive replacement via a checkbox in the Replace tab.

So if you're trying to replace both "Error" and "error" with something else and only typed "error" in the Find box, Notepad won’t catch the capitalized ones unless you adjust your approach.

Use Wildcards or Regular Expressions? Try Notepad++

Plain Notepad doesn't support wildcards or regex patterns. If you need to replace more complex patterns — like numbers, email addresses, or similar-but-not-identical strings — standard Notepad isn't powerful enough.

In that case:

• Download and install Notepad++.
• Open your file and press Ctrl + H.
• At the bottom, check “Match using Regular Expression”.
• Now you can use regex syntax to find and replace patterns.

For example, to replace all digits in a document, you could search for \d and replace with something else.

This opens up a lot more flexibility for advanced users without complicating the basic Notepad interface.

And that's basically how you handle replacing text in Notepad. The standard version works fine for simple tasks, but if you need more control, Notepad++ really shines.

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