For example, if the string "the red king" is matched against the pattern the ((red_BAR_white) (king_BAR_queen)) the captured substrings are "red king", "red", and "king ", and are numbered 1, 2, and 3.
Le ((roi_BAR_prince) (soleil_BAR_charmant)) les sous-masques capturé sont "roi soleil", "roi", et "soleil", numérotés respectivement 1, 2, et 3.