1. wild card system, programming, text> From card games in which certain cards, often the joker, can act as any other card A special character or character sequence which matches any character in a string comparison, like ellipsis ". . . " in ordinary written text. In Unix filenames ? matches any single character and * matches any zero or more characters. In regular expressions, . matches any one character and "[. . . ]" matches any one of the enclosed characters. See also Backus-Naur Form. 2. a playing card whose value can be determined by the person who holds it
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