如下所示的ASCII 影像中：
....X....... ..X..X...X.... X.X...X..X..... X....XXXXXX..... X..XXX........... .....X.......... ..............X ..X...........X.... ..X...........X....X... ....X.....
我們的目標是偵測以下模式：
X X X
其中三個 X 垂直對齊。
是的，下面的正規表示式可以辨識出現的次數垂直X 陣型：
(?xm) # ignore comments and whitespace, ^ matches beginning of line
^ # beginning of line
(?:
. # any character except \n
(?= # lookahead
.*+\n # go to next line
( ?+ . ) # add a character to the 1st capturing group
.*+\n # next line
( ?+ . ) # add a character to the 2nd capturing group
)
)*? # repeat as few times as needed
X .*+\n # X on the first line and advance to next line
?+ # if 1st capturing group is defined, use it, consuming exactly the same number of characters as on the first line
X .*+\n # X on the 2nd line and advance to next line
?+ # if 2st capturing group is defined, use it, consuming exactly the same number of characters as on the first line
X # X on the 3rd line線上示範： https://regex101.com/r/YxPeXe/1
間接解
要計算編隊的數量，我們可以執行以下替換：
regex =>
其中正規表示式是上面的模式。產生的字串長度將等於匹配數。
線上展示： https://regex101.com/r/Tx6R63/1
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