String concatenation operator (+)

You can use the string concatenation operator plus symbol (+) only if you use variables and arithmetic expressions in your macro. See Basic and advanced macro format.

You can write a string expression containing multiple concatenations. The following examples use the string representation required for the advanced format (see Representation of strings and non-alphanumeric characters).
Expression:               Evaluates to:

'Hello ' + 'Fred' + '!'   'Hello Fred!'
'Hi' 'There'              (Error, a + operator is required to concatenate strings)
'Hi' + 'There'            'HiThere'