Regex for finding SCSS variables and class declarations and prepending them with a prefix in Sublime Text

prefixing-scss.md

SCSS

Field	Value
Find	\$([a-z\-_]+)
Where	-*.js,-*.woff,-*.woff2
Replace	$newprefix-$1

Should match these:

$var: 'test';
$var-2: 'test';
$var-test-3: 'test';
$var-test__4: 'test';

But not these:

$40.00
${}

Class declarations

Field	Value
Find	(\W\.)([a-z]+[\w\-_]+)
Where	-*.html,-*.css,-*.js,-*.woff,-*.woff2,-.gitignore
Replace	$1newprefix-$2

how is this used?