This is useful to find word ends, for example both ends to find a whole word. The expression \\bin\\b will match at the separate in in the string He came in through the window, but not at the in in window.
Això es molt útil per a trobar el final de les paraules, o ambdós extrems per a delimitar tota la paraula. L' expressió\\ bin\\ b coincidirà amb el in separat en la cadena He came in through the window, però no amb el in de window.