?matches at most one character from the set below:
Athe literal A (6510 / 1018 / 4116) (case sensitive)
Bthe literal B (6610 / 1028 / 4216) (case sensitive)
Dthe literal D (6810 / 1048 / 4416) (case sensitive)
Fthe literal F (7010 / 1068 / 4616) (case sensitive)
Hthe literal H (7210 / 1108 / 4816) (case sensitive)
Lthe literal L (7610 / 1148 / 4C16) (case sensitive)
Nthe literal N (7810 / 1168 / 4E16) (case sensitive)
Rthe literal R (8210 / 1228 / 5216) (case sensitive)
Sthe literal S (8310 / 1238 / 5316) (case sensitive)
Tthe literal T (8410 / 1248 / 5416) (case sensitive)
Xthe literal X (8810 / 1308 / 5816) (case sensitive)