Filter Lines — Search, Sort & Clean Text Lists
Filter Lines Online — Include, Exclude & Deduplicate Text Lines Instantly
The SimplyUtils Filter Lines tool processes multi-line text and filters it using plain-text keyword matching, regex patterns, or line-length rules — letting you include only matching lines, exclude matching lines, remove blank lines, or deduplicate repeated entries. Ideal for cleaning log files, processing CSV columns, curating word lists, and sanitizing bulk text exports.
How to Filter Lines of Text
- Paste your text — drop in any multi-line content: log output, CSV rows, URL lists, word lists, code lines, etc.
- Choose filter mode — select "Include lines containing" to keep only matches, or "Exclude lines containing" to remove them.
- Enter your pattern — type a plain keyword (case-insensitive by default) or a regex pattern like
/^\d+/to match lines starting with a number. - Apply additional options — enable "Remove blank lines", "Trim whitespace", or "Remove duplicate lines" as needed.
- Copy or download results — the filtered output appears in real-time in the output panel for copy or file download.
Filter Modes Explained
Common Regex Pattern Examples
Comparison of Text Filtering Utilities
Choosing the best tool to filter line metrics depends on whether you require a lightweight graphical playground or terminal speed:
Target Personas & Concrete Use Cases
1. DevOps Engineers & Sysadmins
Clean up heavy application or web logs. Remove verbose `INFO` logs to focus entirely on critical `ERROR` or `WARN` entries without launching heavy text processors or configuring shell arguments.
2. SEO Specialists & Web Marketers
Isolate URL lists, clean duplicate domain entries from search engine reports, or filter search term keyword blocks matching a specific pattern (e.g. including target blog categories).
3. Database Administrators & Data Sanitizers
Remove blank lines or format trailing whitespaces from export text documents. Bypassing duplicate list items makes sure clean bulk payloads import seamlessly into relational tables.
4. Cybersecurity Analysts & Auditing Teams
Isolate network connection records from massive firewall lists. Extract entries matching specific IP ranges or detect unauthorized port calls using custom regex patterns.
Frequently Asked Questions
How many lines can I filter at once?
The tool processes text in your browser's memory — practically unlimited for typical use. We've successfully tested with 500,000+ line log files. Performance depends on your device's RAM and the complexity of the regex pattern.
Is filtering case-sensitive?
Plain-text filtering defaults to case-insensitive. In Regex mode, use the /i flag at the end of your pattern (e.g. /error/i) for case-insensitive regex matching.
Can I filter by line length?
Yes — use a regex pattern like ^.{50,}$ to keep only lines with 50 or more characters, or ^.{1,10}$ to keep only short lines under 10 characters.
Is my text sent to a server?
No. All filtering runs in your browser using JavaScript's native string and RegExp APIs. No text content is transmitted to SimplyUtils servers at any point.
Can I preserve line numbers or indexes during the filtering?
Our output renders as clean, sanitized lists of filtered lines. If you need indexes, prepend line numbers to your input text beforehand, which will then remain during standard regex filters.
All line filtering and regex processing runs 100% in your browser using JavaScript's native string APIs — your text never leaves your device.