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Signature scheme

A signature scheme is a pattern for signatures. The signature scheme N* , for example, represents the letter N followed by any remainder. All signatures beginning with N match this pattern, but not empty signatures or those beginning with any other character.

The signature scheme allows the use of wildcard characters, which stand for a group of characters:

joker	Meaning
?	exactly one sign
@	exactly one letter
#	exactly one digit
*	any string or nothing

The OR operator of signature schemes is a signature scheme that corresponds to a signature that matches at least one of the two signature schemes linked by | (ASCII code 124, usually present on German keyboards). For example, both signature A and signature N correspond to the signature scheme A|N .

While signatures can be a maximum of 10 characters long, signature schemes can be of any length.

The following are some examples of signature schemes:

Signature scheme	Meaning	Appropriate signatures
N	Signature is N	N
N*	Signature begins with N	N234.2 , NU66 , North , N-3
N	Signature includes an N	N234.2 , AN22 , 27NA
AWAY	The signature includes an A and a B , where the A must come before the B.	AB , LAUB , 32A213G6B1
AU####	Signature begins with AU , followed by exactly 4 digits.	AU1234 , AU0001 , AU9876
#L#*	Signature begins with a digit, followed by L , a digit, and any remainder.	1L223.8 , 2L2 , 8L4b
K@*	Signature begins with #L#* , followed by a letter and any remainder or nothing.	KA , KB-Nord , KF31
N1\|N2	Signature begins with N , followed by 1 or 2 and any remainder or nothing.	N1 , N2a , N1000 , N2999
A\|B#	Signature is A or signature is B followed by a number	A , B1 , B9