The following characters have a special meaning:
Recognised symbols
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+ - * / = < > [ ] . , ( ) : ^ @ { } $ #and the following character pairs too:
<= >= := += -= *= /= (* *) (. .) //When used in a range specifier, the character pair (. is equivalent to the left square bracket [. Likewise, the character pair .) is equivalent to the right square bracket ]. When used for comment delimiters, the character pair (* is equivalent to the left brace { and the character pair *) is equivalent to the right brace }. These character pairs retain their normal meaning in string expressions.