#270 · Developer & Config Text Tool

Keep Lines Containing Text

Keep Lines Containing Text filters a block of text down to only the lines that match your keyword, phrase, multi-keyword rule, or regular expression.

Text Input

Line filter options

Recent History

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How to use this text tool

  • Paste or upload your text.
  • Choose the processing mode and enter any required pattern, prefix, suffix, delimiter, or N value.
  • Adjust options such as trimming, blank-line handling, regex, uniqueness, or live processing.
  • Copy, download, print, or swap the processed output.

What this tool does

Keep Lines Containing Text converts the input into a focused output and reports how many lines were changed, skipped, selected, or extracted.

The tool splits text into lines, applies the selected rule to each line, then rebuilds the output while preserving line order unless a reverse option is selected.

Use the processing report to confirm whether the transformation affected the intended rows before copying the result.

Example

Example input: Apple pie Banana bread Green apple Orange juice. Run the tool to generate the cleaned or extracted output shown in the result panel.

Use cases

  • Clean copied documents and OCR text.
  • Prepare lists for spreadsheets, Markdown, code, or CMS publishing.
  • Filter or sample logs and tabular exports.
  • Batch edit line-based text without installing software.

Tips for better output

  • Use Auto mode first when the input format is mixed.
  • Enable trim when copied text contains inconsistent spaces.
  • Use preview statistics to verify changed versus skipped lines.
  • For multiple patterns, separate values with a vertical bar when supported.

Processing details

The page handles text locally with JavaScript. It supports CRLF, LF, Unicode text, empty rows, and common copied-document formatting.

Very large files depend on browser memory. Regex options should be tested on a small sample before processing important data.

FAQ

How do I keep only lines containing a word?

Keep Lines Containing Text processes your text in the browser and returns a clean output with line counts, match counts, and export options. Paste your text, choose the relevant option, and copy or download the processed result.

Can I filter lines using regex?

Keep Lines Containing Text processes your text in the browser and returns a clean output with line counts, match counts, and export options. Paste your text, choose the relevant option, and copy or download the processed result.

How do I use AND or OR keyword searches?

Keep Lines Containing Text processes your text in the browser and returns a clean output with line counts, match counts, and export options. Paste your text, choose the relevant option, and copy or download the processed result.

Can I ignore uppercase and lowercase while filtering?

Keep Lines Containing Text processes your text in the browser and returns a clean output with line counts, match counts, and export options. Paste your text, choose the relevant option, and copy or download the processed result.

Can I export only the matching lines?

Keep Lines Containing Text processes your text in the browser and returns a clean output with line counts, match counts, and export options. Paste your text, choose the relevant option, and copy or download the processed result.

Tool modules

ModulePurpose
Input parserReads pasted text, uploads, and line breaks.
Processing engineApplies the selected rule to every eligible line.
StatisticsReports total, changed, skipped, matched, or extracted lines.
ExportDownloads TXT, CSV, or JSON output.

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