Grep Text
Filter lines by literal text or a JavaScript regular expression, keeping or inverting matches.
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Grep Text filters a block of lines by a pattern, either keeping the lines that match or inverting the test to keep the rest. It is the browser version of the command people already know: paste a log, a list or a file, choose literal text or a JavaScript regular expression, and get back only the lines that matter. Literal mode escapes every special character, so a dot means a dot; regex mode gives you anchors, character classes and groups, with a compile error reported rather than a silent failure. Matching is case-sensitive by default and can be made insensitive with one checkbox. The page is explicit about its scope. The test is per line, so a pattern cannot span two lines, and only whole lines are returned - it does not extract capture groups or highlight the matching fragment. It is the tool for pulling errors out of a log, narrowing a list by a naming convention, and checking which lines contain a pattern before editing them. Literal mode escapes every regex metacharacter, so searching for a version string such as 1.2.3 does not treat the dots as wildcards. Regex mode compiles the pattern once and reports a syntax error before filtering, which is easier to diagnose than an empty result. An empty result is a valid answer, not an error, and the kept count makes that distinction visible.
How to use Grep Text
- Paste the lines to search.
- Enter a literal pattern or a regular expression.
- Copy the filtered lines or clear to start over.
What you get
- The matching lines, or the non-matching lines when inverted.
- Counts of kept and total lines.
- A validation error for an invalid regular expression.
When to use Grep Text
- Keep only error lines from a pasted log.
- Find lines that match a naming convention with a regex.
- Drop lines containing a known noise string by inverting the filter.
Frequently asked questions about Grep Text
Can a pattern match across lines?
No. Each line is tested on its own, so a multi-line expression cannot match.
Which regex syntax is used?
JavaScript regular expressions. Lookbehind works in current browsers, but GNU grep-specific syntax does not.
Does it extract capture groups?
No. It only keeps or drops whole lines; use Find and Replace for substitutions.
Is my text uploaded?
No. Filtering runs in your browser; nothing is sent to a server or stored.
Guides that compare Grep Text
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