[TxMt] perl "=>" operator

perlop(3):

The "=>" operator is a synonym for the comma, but forces any word (con- sisting entirely of word characters) to its left to be interpreted as a string (as of 5.001). This includes words that might otherwise be con- sidered a constant or function call.

For example:

{ format => 'html', server => 'localhost', }

Currently, 'format' has a scope of support.function.perl, while 'server' is source.perl.

\b\w+\s*=> would match, but would should the scope be? string.quoted.other? And how to give it higher precedence than support.function.perl?