Filter List By Pattern

Match keeps items that match the pattern. Exclude removes matching items. Starts With/Ends With check the beginning/end only. Contains searches anywhere in the item. Exact Match requires perfect equality. Regex allows advanced pattern matching with regular expressions.

Select “Regular Expression” mode and enter a regex pattern like ^[a-c] to match items starting with a, b, or c. Use d+ for numbers, .*apple.* for items containing “apple”, etc. Invalid patterns will show an error message.

The output will be empty, and the statistics will show “0 matched”. The preview section will display “No matches” to confirm that the filter was applied but nothing matched your criteria.

Yes. By default, filtering is case-insensitive (so “Apple” matches “apple”). Enable the “Case Sensitive” checkbox if you want exact case matching. In regex mode, this controls whether the i flag is added.

Yes – that’s a primary feature. Input separator tells the parser how to split items; output separator tells the joiner how to rejoin matches. Comma-in → newline-out is a common “CSV column to text-list” workflow; newline-in → comma-out is the reverse.

The tool can efficiently handle lists with tens of thousands of items using optimized regex operations. Performance depends on pattern complexity and your device, but most filters complete instantly.

Yes. Once the page loads, all filtering operations are performed locally in your browser. You can disconnect from the internet and continue using the tool without any interruption.

No, you need to choose one separator per operation. If your list has mixed separators, you can either normalize them first using a find-and-replace tool, or filter multiple times with different separator settings.

Both keep items containing the pattern – the modes are functionally the same in this tool. “Match” is named for the conceptual operation; “Contains” makes the substring intent explicit. Pick whichever reads better to you. The same applies for “Match” vs “Contains” in the stats line readout.