regex101 vs SK Play Labs Regex Tester

regex101 is an online workspace for building, testing and debugging regular expressions. Its editor supports PCRE2, JavaScript, Python, Golang, Java,.NET 10.0, Rust, POSIX ERE, POSIX BRE and legacy PCRE. Explanations show how parts of a pattern match according to the selected flavor, and a step-through debugger helps follow matching. Match results can be exported as JSON, JSON Lines, CSV or plain text. Developer options include HTTP APIs, an MCP server, editor links and a separately licensed parser package. The workspace API stores editor data but does not provide a remote matching endpoint. File loaders read text, bytes and supported documents locally in the browser; saving or sharing workspace input can send it to the workspace service. Free includes core tools, one test string and saved workspaces with an account. Pro costs €4.99 a month, billed yearly, and adds multiple test strings, substitution pipelines, advanced benchmarking, formatting and an ad-free workspace. Enterprise is a self-hosted option with documented deployment on Linux using Docker Compose, MySQL and Redis.

SK Play Labs Regex Tester is a free web tool for testing and learning regular expressions. Entered patterns are matched against sample text, with matches highlighted and capture groups listed as the pattern runs. The tool explains metacharacters, quantifiers, groups, and character classes in plain English, token by token, and includes a cheat sheet with symbol meanings and examples. Patterns execute in the browser through JavaScript’s built-in regular-expression engine. The global flag is always enabled; ignore-case, multiline, and dotall can be toggled. Because JavaScript, PCRE, Python, and Go differ in some behavior, the maker advises checking patterns in their target language. Explanations are intended for learning and may describe highly unusual constructs generically. The maker says text stays in the browser and is not uploaded. No account is required, and the site says everything is free. SK Play Labs is based in Bengaluru, India.