| Microsoft XML Core Services (MSXML) 5.0 for Microsoft Office - XML Schemas |  |
Character Class Subtraction
A character class expression subtracted from a positive character group or negative character group using the subtraction (-) character.
Syntax
charClassSub ::= ( posCharGroup | negCharGroup ) '-' charClassExpr
For any positive character group or negative character group G, and any character class expression C, G-C is a valid character class subtraction that identifies the set of all characters in C(G) that are not also in C(C).
See Also
XML Schema Regular Expressions | XML Schema Regular Expressions Reference Chart | Negative Character Group | Data Type Facets | Positive Character Group