About the Remove Lines Containing
Filter lines by content: remove lines that contain a word, phrase or regular expression, or keep only those lines.
Key features
- Remove lines that contain a word or phrase
- Or keep only the matching lines (like grep)
- Regular expression support
- Case-insensitive option
- Fast on large logs and lists
- Runs in your browser
Filter lines by content
Need to clean noisy logs, drop unwanted rows from a list, or pull out only the lines that matter? Remove Lines Containing filters text line by line using a word, phrase or regular expression, in either direction.
Example
INFO server started
DEBUG cache warmed
ERROR db timeout
INFO request /home
DEBUG gc pause
| Filter | Mode | Result |
|---|---|---|
DEBUG | Remove | INFO, ERROR and INFO lines |
ERROR | Keep | ERROR db timeout |
INFO|ERROR (regex) | Keep | All INFO and ERROR lines |
Handy regular expressions
| Pattern | Matches lines that… |
|---|---|
^# | start with # (comments) |
\d{3}-\d{4} | contain a number like 555-1234 |
@gmail\.com$ | end with @gmail.com |
^\s*$ | are blank |
\b(error|fail)\b | contain the word error or fail |
https?:// | contain a URL |
Use cases
- Log analysis: hide DEBUG noise or keep only errors.
- Email lists: remove personal domains or keep only company addresses.
- Code: strip comment lines or console.log statements.
- SEO: filter keyword lists containing brand terms or unwanted words.
- Data cleanup: drop header, footer or total rows from exports.
Command-line equivalents
grep -v "DEBUG" app.log # remove matching lines
grep -E "INFO|ERROR" app.log # keep matching lines
Related tools
Sort the result with Sort Text Lines, de-duplicate with Remove Duplicate Lines, or extract columns with the Delimited Text Extractor.
How to use the Remove Lines Containing
- Type or paste your text into the input box.
- Choose the options you want.
- The result updates instantly as you type.
- Copy the output or download it as a .txt file.