The output is not what I expected.
Recheck the input, selected options and the limitation notes below; preserve the original before trying a destructive cleanup. Regex mode follows JavaScript syntax, not every regex dialect.
Remove Lines Containing Tool
Filter a list or log by deleting every line that matches a phrase or JavaScript regex.
What this tool does
Enter a literal substring or enable regex mode for a JavaScript regular expression. Matching lines are removed; non-matching and unmatched empty lines remain, so preview the result before replacing source data. Regex mode follows JavaScript syntax, which differs from some other regex dialects.
Enter a phrase or regex, preview the matching lines and remove them.
Maximum 500,000 characters: 0 / 500000
No result
How to use it
Paste the multiline text and enter the phrase or pattern to match.
Choose literal or regex mode and set case sensitivity.
Preview removed lines, correct an invalid pattern if needed and copy the filtered result.
Key features
- Literal substring matching.
- JavaScript regular-expression mode.
- Optional case-insensitive filtering.
Practical use cases
- Removing noisy log entries with a known marker.
- Dropping list rows that contain a blocked phrase.
- Cleaning generated output with a reproducible regex filter.
Limitations and important notes
- Regex mode follows JavaScript syntax, which differs from some other regex dialects.
- Metacharacters must be escaped when they should be matched literally.
- The tool removes matching lines and leaves unmatched lines, including unmatched blank lines, in place.
Troubleshooting
The page becomes slow with a large input or repeat count.
Reduce the input, split the operation into smaller batches and close other memory-heavy tabs. Keep an original copy before retrying.
The result changes after I paste it elsewhere.
Test the destination app, font and character encoding. Some apps normalize whitespace or render Unicode differently.
Frequently asked questions
How do I remove lines containing a word?
Enter a literal substring or enable regex mode for a JavaScript regular expression. Matching lines are removed; non-matching and unmatched empty lines remain, so preview the result before replacing source data.
What regex syntax is used?
Use JavaScript RegExp syntax. Test complex expressions and show a clear error for invalid patterns.
Why did the pattern remove too many lines?
A regex metacharacter may be broad or case-insensitive mode may be active. Test a smaller sample before processing the full text.
What are the limitations?
Regex mode follows JavaScript syntax, which differs from some other regex dialects. Metacharacters must be escaped when they should be matched literally. The tool removes matching lines and leaves unmatched lines, including unmatched blank lines, in place.
Related tools
Use the tool
Enter a phrase or regex, preview the matching lines and remove them.