3.2.59. VERIFY(string,ref[,[option][,start]]) With only the first two parameters, it will return the position of the first character in string that is not also a character in the string ref. If all characters in string are also in ref, it will return 0. If option is specified, it can be one of: [N] (Nomatch) The result will be the position of the first character in string that does exist in ref, or zero if all exist in ref. This is the default option. [M] (Match) Reverses the search, and returns the position of the first character in string that exists in ref. If none exists in ref, zero is returned. If start (which must be a positive whole number) is specified, the search will start at that position in string. The default value for start is 1. VERIFY(‘foobar’, ‘barfo’) –> ‘2’ VERIFY(‘foobar’, ‘barfo’, ‘M’) –> ‘2’ VERIFY(‘foobar’, ‘fob’, ‘N’) –> ‘5’ VERIFY(‘foobar’, ‘barf’, ‘N’, 3) –> ‘3’ VERIFY(‘foobar’, ‘barf’, ‘N’, 4) –> ‘0’
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