Better support for textmate snippets regexp

Complex regexp that inserts symbols on the same line as input, but before the cursor doesn't work.

Here's an example that works perfectly in TextMate but doesn't in Sublime Text 2

color ${1/(^\h{1,6}$)|.+/(?1:#)/}${1/(^\(.*$)|.+/(?1:rgb)/}${1/(^\(.*,.*,.*,.*$)|.+/(?1:a)/}${1:f}${1/(^\([^)]*$)|.+/(?1:\))/}${1/(^\h{1,2}$)|.+/(?1:$1$1)/}