There are six (6) user defined masks you can specify in the mask files. If you want to use specific mask characters other than the default set (for example, Asian characters), you can add them as user defined masks.
To specify user defined masks
Example
USER-DEF-1
*n - Chinese numerics (1-9)
U006E(U4E00,U4E8C,U4E09,U56DB,U4E94,U516D,U4E03,U516B,U4E5D)
USER-DEF-2
*Y - Other characters (S, N, #, 0-9)
U0059(U0053,U004E,U0023,U0030-U0039)
USER-DEF-3
*X - Double width numeral (roman and latin)
U2169(U2160-U216B,U2170-U2179,UFF10-UFF19)
USER-DEF-4
*e - Even single digit numbers (0, 2, 4, 6, 8)
U0045(U0030,U0032,U0034,U0036,U0038)
USER-DEF-5
*K - Japanese Katakana characters
U004B(UFF67-UFF9F,U30A1-U30F6,U30FD,U30FE)
USER-DEF-6
*J - Japanese Hiragana characters
U004A(U3041-U3093)