| "Tm,n"
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| where m (optional) = the start position in the string; n = the number of characters to extract. The characters extracted are always left to right.
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 Examples
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| "T3,2" - extracts 2 characters starting at the 3rd in the string e.g. abCDef gives CD.
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| "T12" - will extract the 12 rightmost characters if the length attribute in the definition is 'R' or the 12 leftmost characters if this is 'L'.
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