正则表达式来验证双值 [英] regex to validate double values

问题描述

我正在尝试提出一个正则表达式来验证双精度值.我承认我在正则表达式方面很垃圾，真的应该买一本书......无论如何，范围很大，所以这里是:

I'm trying to come up with a regex to validate a double value. I will admit that I am crap at regex and really should buy a book... Anyway the range is large so here goes:

.01 到 99.99 是范围，前导 '00' 是可选的，'.' 也是可选的.尾随的.00"也是如此.所以用户可以输入 0.1 00.01, 0.11, 1, 1.0 1.00 这些都是有效的.

.01 to 99.99, is the range, with the leading '00' being optional, as is the '.' and the same for the trailing '.00'. So the user could type in 0.1 00.01, 0.11, 1, 1.0 1.00 and these all would be valid.

谢谢，r.

推荐答案

与其使用 RegEx，为什么不使用 double 的 TryParse 方法?

Rather than a RegEx, why not use double's TryParse method?

string[] sa = new string[] { "00.01", "1.00", "xx" };
double d;
bool isValid;
foreach (string s in sa)
{
    isValid = double.TryParse(s, out d) && d >= 0.01d && d <= 99.99d;
    Console.WriteLine("{0}: {1}", s, isValid.ToString());
}

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