Five years ago I posted Mimicking Lookbehind in JavaScript on this blog, wherein I detailed several ways to emulate positive and negative lookbehind in JavaScript. My approaches back then were all fairly rough, and it was complicated to properly customize any of them to work with a given pattern. Plus, they were only designed to [...]

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Recently, I've added three new addons for XRegExp v2.0 (currently in release candidate stage on GitHub): XRegExp.build — Lets you build regexes using named subpatterns. Inspired by Lea Verou's RegExp.create. XRegExp Prototype Methods — Adds a collection of methods to be inherited by XRegExp regexes: apply, call, forEach, globalize, xexec, and xtest. These also work [...]

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A few days ago, I posted a long-overdue XRegExp bug fix release (version 1.5.1). This was mainly to address an IE issue that a number of people have written to me and blogged about. Specifically, RegExp.prototype.exec no longer throws an error in IE when it is simultaneously provided a nonstring argument and called on a [...]

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After stalling for nearly a year, I've finally released XRegExp 1.0, the next generation of my JavaScript regular expression library. Although it doesn't add support for lookbehind (as I've previously suggested) due to what would amount to significant inherent limitations, it fixes a couple bugs, corrects even more cross-browser regex inconsistencies, and adds a suite [...]

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Update: Many of the details described below are now out of date. Get the latest version of the Unicode plugin for XRegExp. I've released a simple plugin for XRegExp (my JavaScript regex library) that adds support for Unicode properties and blocks to JavaScript regular expressions. It uses the Unicode 5.1 character database, which is the [...]

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