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var expressionStr = "asxfdc78sd**+a6.+7ty6+xac0acs.6csa";
//78*6.76+0.6
var expression = Regex.Replace(expressionStr, @"[a-z]","").Replace("**+","*").Replace(".+",".");
DataTable eval = new DataTable();
object expressionresult = eval.Compute(expression, "");