Deceptive documentation

[z5h]

The documentation says for Regex says:

A regular expression as specified in JavaScript.

and links to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

Not mentioned/clear in the Elm doc, or linked reference, is the fact that not all documented features are implemented in recent major browsers. For example lookaheads and lookbehinds.