Rubular

Rubular is a web-based regular expression editor and tester built on the Ruby 2.5.9 regex engine. It lets you write a pattern, apply it to sample text, and see matches, which helps when developing or debugging regular expressions for Ruby or checking how a pattern behaves against input.

The interface includes clear fields for the expression and test string, along with a quick reference covering common tokens such as character classes, anchors, quantifiers, groups, and alternation. Supported options include case-insensitive matching, multiline mode, ignore-whitespace mode, and one-time `#{...}` substitutions. The page also notes a permalink feature for sharing a specific expression and test case.

Rubular is aimed at developers and anyone working with regular expressions who wants a browser-based place to test Ruby-flavored patterns. The pages do not describe plans, trials, editions, or seat- or usage-based packaging.