Allow use of find/replace regex to compute property values

[nickidlugash]

Currently we can't make use of the way duplex shields in the mapbox streets data are designed to be styled, because we can't use regex as part of values, and we also don't accept \n as a space for line wrapping. Is it feasible to implement the ability to use find/replace and \n?

[1ec5]

The regex half of this is covered by #233.

[jfirebaugh]

#233 is for the use of regexes in filters, which is a different use case.

I seem to recall an issue for wrapping on newlines, but I can't find it at the moment.

[lucaswoj]

We have a separate issue for regex support and have already implemented newline support.

[jfirebaugh]

As noted above: the other issue is for regex support in filters. This is about regex support in functions.

[lucaswoj]

This issue was moved to mapbox/mapbox-gl-js#4100