Define String formats for String Constructor

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Supported Formats:
"-1+1j" "-1+1i" "-1+i1" "-1+j1" "-1e^j1" "-1e^i1" "-1e^1j" "-1e^1i" "-1,1°"

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"-1+1j" "-1+1i" "-1+i1" "-1+j1" "-1e^j1" "-1e^i1" "-1e^1j" "-1e^1i" "-1/1°"