How to delete all lines containing a specific string in Notepad

Open Notepad and press Ctrl H to access Replace.In "Find what", enter ^.your_string.$\r?\n?, replacing your_string with target text.Leave "Replace with" empty, enable Regular expression mode, ensure ". matches newline" is off.Click Replace All to delete all lines containing the string, supporting both Windows and Unix line endings.

To delete all lines containing a specific string in Notepad , you can use the Find and Replace feature with regular expressions. This method is fast and efficient, especially for large files.

Open Find and Replace

Press Ctrl H to open the Replace tab in the Find dialog. Make sure you're on the "Replace" panel, not "Find".

Use Regular Expressions to Remove Lines

In the "Find what" field, enter:

Replace your_string with the actual text you want to remove lines for. For example, if you want to delete lines containing "error", type:

Leave the "Replace with" field empty.

At the bottom, select Search Mode as Regular expression, and make sure ". matches newline" is unchecked.

Execute the Replacement

Click Replace All. All lines containing the specified string will be removed.

Note: If your file uses Unix-style line endings (LF only), you might want to adjust the regex to handle that. The pattern \r?\n? covers both Windows (CRLF) and Unix (LF) line breaks.

Basically just match the whole line containing the string and replace it with nothing. It’s a clean way to filter out unwanted lines quickly.

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