Write regular expressions with instant match highlighting, capture group inspection, and plain-English regex token breakdowns.
Executes regex patterns against test strings across multiple engine flavors (PCRE, JavaScript, Python, Golang), displaying match details and step-by-step logic.
Constructing input validation patterns (emails, phone numbers, UUIDs), extracting regex capture groups, or optimizing regex execution performance.
Ranked by feature completeness, privacy safety, and ease of use.
Interactive regular expression tester, explainer, and visual debugger.
Regex101 allows you to test, debug, and understand regular expressions in real time across PCRE2, JavaScript, Python, Go, and Java engines.
The quick and simple editor for cron schedule expressions.
Crontab Guru is an interactive cron schedule builder and plain-English translator that shows exact upcoming run timestamps.
Common questions and practical advice for completing this task.
Regex101 explains every individual quantifier, lookahead, and character class in plain English and provides a visual debugger to track match steps.
Fix malformed JSON, format minified API payloads with indentation, and explore complex nested JSON visually in an interactive tree.
Create crontab schedules with an interactive builder and read exact human-readable execution times.
Swiss Army knife for developers: Base64, Hex, URL encoding, SHA-256 hashing, JWT inspection, and binary data pipelines in browser.