Keep only the lines that contain a search term, or remove every line that contains it - useful for narrowing a long list down to what you need, or stripping out rows that match an unwanted pattern.
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Want to change text within lines instead of keeping or discarding whole lines? Try Find and Replace.
"Keep matching lines" throws away every line that doesn't contain your search term, leaving only the lines that do. "Remove matching lines" does the opposite - it deletes every line that contains your search term and keeps everything else.
No - it matches if your search term appears anywhere within the line, as a substring. A search for "fruit" would match a line like "banana - fruit, sweet" because "fruit" appears somewhere in it, not because the whole line equals "fruit".
Yes - the search term can be any text, including spaces, not just a single word. Searching for "out of stock" will match any line containing that exact phrase.
Find and Replace changes text within lines but keeps every line. Filter Lines works at the line level instead - it decides whether to keep or discard entire lines based on whether they contain your search term, rather than modifying their contents.