To specify either an asterisk ( * ), as a literal character rather than a wildcard character in the pattern, or a period ( . ) as a literal character, you must enter a tilde (~) before the character. However, if you specify the match pattern as a literal quoted string in a procedure file, you must enter each tilde as a double tilde ( ~ ~ ). The first tilde escapes the second tilde, so that the AVM interprets the second tilde as a tilde for the match pattern. For example, the result of “*a.b” MATCHES “~~*a~~.b” is TRUE.