Write, test and understand regular expressions and pattern-matching rules.
Test regular expressions against sample text with live match highlighting, capture groups and flags.
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Extract, clean, parse and build URLs and structured data from API responses.
Encode, decode, hash and inspect tokens — Base64, JWT, hashes and IDs.
Pretty-print, minify, convert and validate JSON, YAML, XML, SQL and more.
Headers, cron expressions, environment files and everyday operations helpers.