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String operators

There are two string operators. One uses the string values of the operands and return a string as result. The other one compares the operands and returns a boolean value to indicate match.


String concatenation. The operation returns a text string, that consists of the two operand strings, one after another.


'abc' & 'xyz' returns 'abcxyz'



String comparison with wildcard characters. The operation returns a boolean True (-1) if the string before the operator is matched by the string after the operator. The second string may contain the wildcard characters * (any number of arbitrary characters) or ? (one arbitrary character).


'abc' like 'a*' returns True (-1)

'abcd' like 'a?c*' returns True (-1)

'abc' like 'a??bc' returns False (0)

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