A mask character is used in a where condition CONTAINS clause (in a FOR statement for CA Datacom/DB native command access only) to mark the position of a character to ignore in the comparison of a character string. For example, if an asterisk (*) is specified as a mask character, then *AB* represents "any character followed by AB followed by any character". For more information about how to specify mask characters, see the $FIXED‑MASK function in the "Symbolic Debugger commands" chapter.
The default mask character is an asterisk (*).
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