Returns a substring from the middle of the specified text.
mid ( text, start_num, num_chars )
text: (Text) The text from which the substring will be extracted.
start_num: (Number) The positional index of the first character of the substring to be returned.
num_chars: (Number) The length in characters of the substring to extract.
The first character of the entire text value is considered to have an index = 1.
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