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 pascal state machine delphi SCRIPT  TFPExpressionParser Regular Expression

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https://wiki.freepascal.org/How_To_Use_TFPExpressionParser 

https://wiki.freepascal.org/FPSpreadsheet_tutorial:_Writing_a_mini_spreadsheet_application

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https://torry.net/pages.php?id=307

http://www.gobestcode.com/html/mathparser.html

https://en.wikipedia.org/wiki/Pascal_(programming_language)