$Verify
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The $VERIFY function returns a 1 (true) if every character contained in the string is present in the second string. Otherwise, 0 (false) is returned. If the second argument is a null string, 0 is returned. If the first argument is a null string but the second argument is not, a 1 is returned.
$VERIFY can be used whenever $ALPHA, $ALPHNUM, and $VNUM do not provide sufficient flexibility.
Example 1
$VERIFY('1975','0123456789') equals 1 $VERIFY('-19.5','0123456789+-.') equals 1 $VERIFY('12A','0123456789') equals 0
Example 2
$VERIFY('ABC',") equals 0 $VERIFY(",") equals 0 $VERIFY(",'1234567890') equals 1