Opera announced implementing a new ECMAScript/JavaScript engine called “Carakan,” a new register based JavaScript VM that is currently 2.5 times faster than their existing one Futhark (based on SunSpider). It does native code generation including at specializing for Regex.

Interestingly since, Chrome team have announced irregexp, a faster Regexp engine for Chrome. Irregexp builds on V8's existing infrastructure for memory management and native code generation and is tailored to work well for the kinds of regexps used by JavaScript programs on the web. The result is a considerable improvement in V8's regexp performance.

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Source:→ Ajaxian