单项选择题
You define the following regular expression of currency values:
regex tx = new regex("^-?\d+(\.\d{2})?$")
You are required to write code that will be used to find whether a string in the variable named Bill matches the regular expression or not. You are also required to use this code as the expression in a conditional statement and need to know which code segment to use.
What should you do?（）
A.The tx.Matches（Bill）
B.The tx.Equals（Bill）
C.The tx.Match（Bill）
D.The tx.IsMatch（Bill）
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