Try this
Value1 = System.Text.RegularExpressions.Regex.Matches(Input,"((?<=Base Amts :)([ \d,.]+)(?=.*\s*Correct))").First.ToString.Trim
Value2 = System.Text.RegularExpressions.Regex.Matches(Input,"((?<=Base Amts :)([ \d,.]+)(?=.*\s*Correct))").Last.ToString.Trim
Output:

Regards,
