Word boundaries

I need an autocomplete-combobox with word boundaries matching

Using this http://jqueryui.com/demos/autocomplete/#combobox

and this

http://bugs.jqueryui.com/ticket/6043

var matcher = new RegExp( '^'+$.ui.autocomplete.escapeRegex(term), "i" );

autocomplete finds the begging of an option, but

var matcher = new RegExp( '\\\\b'+$.ui.autocomplete.escapeRegex(term), "i" );

does not work.