Regex Lab

Tests a JavaScript regular expression against text as it is typed: matches are highlighted and listed with their capture and named groups, under the flags g, i, m, s and u, with a replace mode and 12 common patterns. Syntax is that of ECMA-262. Stephen Kleene described regular events in a 1951 RAND memorandum; Ken Thompson's 1968 paper in Communications of the ACM compiled them for text search.

• Ecma International, ECMA-262, ECMAScript Language Specification
• S. C. Kleene, Representation of Events in Nerve Nets and Finite Automata, RAND RM-704 (1951)
• Ken Thompson, “Regular Expression Search Algorithm”, Communications of the ACM 11 (6), 1968, pp. 419–422