OpenWebmasterby Mello Zone

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Custom extraction · regular expressions

Extract patterns from supplied source without crawling

Paste HTML, Markdown, logs, titles, redirects, schema, or copied page text. OpenWebmaster runs bounded JavaScript regular expressions locally, keeps capture groups and source context visible, and exports every retained rule without uploading content.

SOURCE300,000 CHARSRULES20 MAXNETWORKNONE

Use regex extraction for template checks, schema IDs, URL patterns, tracking fragments, product codes, log rows, or CMS markup. It is exact source matching, not a crawl or rendered-page test.

Extraction rulesJavaScript regex syntax · global matching is automatic · Unicode mode is included

High-risk nested repeated patterns and backreferences are rejected before execution. Valid rules still run when another rule is invalid.

.*

Ready for supplied source and your patterns.

No sample matches, extraction score, generated regex, crawler result, rendered-DOM claim, or manufactured issue count appears before you paste source.

Practical source extraction

Use regex where source structure is inconsistent

Find patterns selectors miss

Extract IDs, tracking parameters, inline schema values, canonical fragments, log tokens, or redirect-map fields when they are easier to describe as text patterns than elements.

Keep rules readable

Prefer anchored literals and capture groups you can explain in a QA note. Dense expressions can hide assumptions and become hard to maintain.

Pair it with live evidence

Use CSS selector extraction or source search when you need a live page check; use this tool when you already have the exact source or export in hand.