Notepad files are often used in text and data cleaning tasks where you sometimes need to quickly find and delete entire lines containing specific keywords. For example, deleting all lines containing [ERROR] from system-generated logs to simplify the log file; removing all entire lines containing [Test] from data export results; or deleting all lines marked with [Resigned] from a contact list. We usually have to open each file, use find and replace to search for the keyword, and then directly delete the entire line of text containing that keyword. Even when dealing with only a few files, the repetitive operations can still cause fatigue, let alone when facing dozens or even hundreds of files.
So how should we directly find specific keywords in all TXT files and batch-delete entire lines of text containing that keyword in such a scenario? Here are several immediate methods that can quickly resolve this with just a few steps. Learn how to do it with me!
When should you delete entire lines containing a specific character in a TXT file?
Cleaning file data
When processing TXT files, they often contain many error prompts or duplicate records, which generally include a common character or keyword as an identifier. Instead of searching line by line, we can directly use this character as a basis to delete all lines containing it, quickly cleaning the file and retaining only truly useful information.
Removing redundant information
Some TXT text is exported from systems or devices and contains both valid and invalid data mixed together. Invalid data often includes fixed terms like test or failure. By judging whether a line contains a specified character and then deleting the entire line, the filtering work can be completed very efficiently. Compared to manual deletion, it is much simpler and less prone to omissions.
Preventing human errors
When a Notepad file has a large amount of content, with tens of thousands of lines, manually searching for and deleting lines containing a certain character is not only extremely time-consuming but also prone to accidental deletions or missed lines. It is also easy to accidentally delete useful information, causing subsequent data mismatches. Using the method of deleting entire lines by keyword ensures consistency and stable results. After the batch operation is completed, the file content will be cleaner and the structure clearer.
Preview of the effect of deleting entire lines containing a keyword in a TXT file
Before processing:
After processing:
Method 1: Use HeSoft Doc Batch Tool to batch delete entire lines in TXT files
Recommended index: ★★★★★
Advantages:
- Simple operation. You only need to enter a keyword to batch delete entire lines of text containing that keyword. Dozens or hundreds of files can be quickly processed in batches. It also supports file formats like Word and PDF.
- All files are processed locally, without requiring file uploads, protecting user privacy and security.
Disadvantages:
- You must install the software on your computer to operate.
Operation steps:
1. Open 【 HeSoft Doc Batch Tool 】, select 【Text Tools】- 【Find and replace entire lines in text files based on keywords】.
2. Choose a method under 【Add File】 or 【Import Files from Folder】 to import the TXT files whose text lines need to be deleted. You can also drag the files directly below. After confirming the files are correct, click Next.
3. Enter the settings options interface. Choose 【Precise Text Search】 as the search method. Then, in the keyword list below, enter the keyword contained in the line. Leave the replacement keyword list below empty by not entering anything. Finally, click Next again. Then click Browse and select the save location for the new file.
4. After waiting for the process to finish, click the red path to open and view the TXT text file where lines containing the keyword were successfully deleted.
Method 2: Use Notepad++ for batch deletion
Recommended index: ★★★☆☆
Advantages:
- Simple and intuitive operation, allowing real-time viewing of results to avoid accidental deletions.
- Supports multiple encodings and allows opening multiple files simultaneously for batch processing.
Disadvantages:
- May respond slowly when processing text files exceeding 100 MB.
- Although free to process, it still needs to be opened and installed.
Operation steps:
1. Open the TXT file with Notepad++, press Ctrl + F to open the Find dialog.
2. Select 【Mark】, enter the keyword to search for, check 【Bookmark line】, and finally click 【Mark All】 to delete.
Method 3: Use Excel's filter function to batch delete entire TXT lines containing the keyword
Recommended index: ★★★☆☆
Advantages:
- Most people know how to operate Excel; it's very familiar and common, so even beginners can handle it.
- Allows preview before deletion, making it very suitable for structured text.
Disadvantages:
- Using Excel for plain text is somewhat wasteful of human resources.
- More complex formats might become disordered.
Operation steps:
1. Open the TXT file with Excel; data will be automatically split into columns.
2. Find 【Data】 and click the 【Filter】 button.
3. Enter the keyword to filter.
4. Delete the filtered rows, and finally save as TXT.
