Filter Lines — Online Grep to Keep or Remove Matching Lines

Cách dùng

1. 1 Paste lines on the left and a pattern below.
2. 2 Toggle Keep matching (default) or Remove matching.
3. 3 Switch on Regex for full regular expression power, with i / m / u / s flag toggles.
4. 4 Copy the filtered result.

Vì sao dùng công cụ này

• Plain substring match by default — no regex special-character traps.
• Regex mode with the four most-used JS flags exposed as checkboxes.
• Invert match flips just the match, leaving Keep/Remove logic intact.
• Bad regex shows inline, never crashes the page.

Câu hỏi thường gặp

Filter Lines là gì?

A Filter Lines tool is a tool that keeps or removes lines of text matching a substring or regular expression pattern. It supports inverting the match, case-insensitive comparison, and trimming each line before matching. Running entirely in the browser, it works like an online grep for filtering text, letting users find and remove lines containing specific content without sending data to a server.

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