Extract and Replace Text with Regex

Use regex to find patterns, extract data, or prepare find-and-replace operations before running them in your editor.

Nid oes angen mewngofnodi

Regular expression

//g

Flags:

Examples:

Test text

Matches

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs.Enter a pattern above to see matches highlighted here.

Text Processing tips

🔤

Test your search pattern here before running a global find-and-replace in your code editor or text processing script.

🎯

Use the "g" (global) flag to see all matches at once. The match count in the top-right updates in real time as you type.

💡

Alternation (cat|dog) matches either word. Useful for extracting multiple related terms from a large body of text in one pass.

🔢

Quantifiers: \d{3} matches exactly 3 digits; \d{2,4} matches 2 to 4 digits; \d+ matches one or more. Test each against your data.

Ewch i mewn

Enter your data into the tool above. Everything stays local to your browser.

Proses

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Lawrlwythwch

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Hollol rhad ac am ddim - dim costau cudd, byth

✓Nid oes angen cyfrif, e-bost na mewngofnodi

✓Nid yw ffeiliau byth yn gadael eich dyfais

✓Dim cyfyngiadau maint ffeil o gwbl

✓Dim dyfrnodau ar unrhyw allbwn

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