RegExp lookbehind assertions · V8

Show navigation Introduced with the third edition of the ECMA-262 specification, regular expressions have been part of Javascript since 1999. In functionality and expressiveness, JavaScript’s implementation of regular expressions roughly mirrors that of other programming languages. One feature in JavaScript’s RegExp that is often overlooked, but can be quite useful at times, is lookahead assertion

[cu39]

"by running V8 version 4.9 or later with --harmony, or by enabling experimental JavaScript features (use about:flags) in Chrome from version 49 onwards."

[teppeis]

V8がRegExp肯定/否定後読み(ES next Stage 0)を試験実装 / “V8 JavaScript Engine: RegExp lookbehind assertions”

[efcl]

V8が https://github.com/goyakin/es-regexp-lookbehind を試験的に実装