How to filter text lines by keyword online
Keep matching lines or remove unwanted lines
Filter text lines without uploading a file
Example: filter a list of text lines
Copy or download filtered text results
Features explained
Keyword and phrase query
Enter a search term through the query option. Its default value is an empty string, so provide a query to filter for a particular word or phrase.
Matching rule selection
The matchMode option determines how a line is compared with the query. The exact list of supported matching rules is not established by the supplied processing snippet.
Case-sensitive filtering
Set caseSensitive to control whether matching distinguishes uppercase and lowercase letters. The default is false, so matching is configured as case-insensitive by default.
Keep or exclude matches
Set keepMatches to decide whether matching lines stay in the output. The default is true, which retains lines that satisfy the matching rule.
Copy filtered output
Use Copy to copy the resulting text. The interface also has a Copied! label for its copied state.
Download and load example
Download saves the filtered result, while Load Example provides a way to populate sample input. The exact download format and example contents are not specified in the supplied code.
Clear and reset input
The interface includes a Clear action and a reset/clear capability. The precise behavior of the shared reset handler is not shown in the supplied processing snippet.
What can you use it for?
Clean text lists
Keep only lines containing a chosen word, or exclude those lines to remove unwanted entries from a pasted list.
Review application logs
Filter copied log lines by a term such as error or warning, provided the selected matching rule supports the desired comparison.
Organize research notes
Retain lines that mention a topic or remove lines that match a query before moving the remaining text into another document.
Sort keyword research results
Separate lines containing a keyword from other entries when preparing a plain-text list of search terms or ideas.
Filter copied text on mobile
Paste text into the input and apply the same query and matching options. The supplied code does not specify device-specific restrictions.
Tool information
| Tool mode | filterLines |
|---|---|
| Processing | Client-side |
| Input format | Plain text, split into lines |
| Default query | Empty string |
| Default case sensitivity | false |
| Default keep matches | true |
| Output format | Filtered lines joined with newline characters |
| Available actions | Copy, Download, Load Example, Clear |
Benefits
- Filter multiple lines using a query instead of reviewing every line individually.
- Choose whether matching lines are kept or excluded.
- Control case sensitivity through the available option.
- Copy the result or use Download to save it.
Limitations
- The matching rule names and their complete behavior cannot be confirmed from the supplied processing snippet.
- The tool's maximum input size and maximum number of lines are not specified.
- The download filename and file extension are not confirmed.
- The code does not establish support for regular expressions, multiple simultaneous queries, or advanced filtering conditions.
How text processing works
The supplied processing code identifies this tool as client-side, and no fetch or API call was found in the scanned files for filtering. This supports saying that the filtering operation runs in the browser. It does not establish broader guarantees about analytics, hosting logs, browser extensions, or other site-level data handling.
Tips
- Enter a meaningful query before filtering because the default query is empty.
- Leave caseSensitive set to false when uppercase and lowercase differences should not affect matching.
- Keep keepMatches enabled when you want to retain matching lines; disable it when you want to exclude them.
- Try Load Example to see how the input and output areas work.
- Review Filtered Output before using Copy or Download.
Frequently asked questions
How do I filter text lines by a specific keyword?
Enter the keyword in the query option and choose a suitable matchMode. Keep keepMatches enabled to retain matching lines. The query defaults to an empty string, so enter your keyword before running a meaningful filter.
Can I remove lines that contain a word?
Yes. Set keepMatches to false to exclude lines that match the query. Choose the appropriate matchMode and check the output to confirm that the unwanted lines have been removed.
Does the text line filter distinguish uppercase and lowercase?
Yes. The caseSensitive option controls case-sensitive matching. Its default is false, which configures matching to ignore uppercase and lowercase differences unless you change the option.
Can I filter a plain text list in my browser?
Yes. The supplied processing code runs on the client side and handles text as lines. No fetch or API call was found in the scanned filtering logic, although this alone does not prove every aspect of the website's privacy behavior.
How do I keep only lines matching a phrase?
Set query to your phrase, select the desired matching rule, and leave keepMatches set to true. Only lines that satisfy the selected matching rule are retained in the output.
Can I filter text without uploading the file?
Yes. You can paste your text directly into Input Text, and the supplied filtering logic runs on the client side. The code does not show a server request for the filtering operation, but broader site-level data handling is not established.
How do I copy filtered text to another app?
Yes. Use the Copy button after reviewing Filtered Output. The interface also includes a Copied! label for the copied state. The supplied code does not establish clipboard permissions or behavior in every browser.
Can I download the filtered text as a file?
Yes. The interface provides a Download button for the result. The supplied files do not confirm the downloaded filename, file extension, encoding, or whether the browser asks you to choose a destination.
Is there a maximum number of lines I can filter?
No confirmed maximum is available in the supplied code. The processing snippet does not define a line-count limit or maximum input size, so a specific capacity cannot be promised.