A source code transpiler that

regexpu is a source code transpiler that enables the use of ES2015 Unicode regular expressions in JavaScript-of-today (ES5). It rewrites regular expressions that make use of the ES2015 u flag into equivalent ES5-compatible regular expressions.

Here’s an online demo.

Traceur v0.0.61+, Babel v1.5.0+, esnext v0.12.0+, and Bublé v0.12.0+ use regexpu for their u regexp transpilation. The REPL demos for Traceur, Babel, esnext, and Bublé let you try u regexps as well as other ES.next features.

Consider a file named example-es2015.js with the following contents:

var string = 'foo