正则表达式允许-90.0和90.0之间的数字

问题描述

什么是正则表达式，以便-90.0和90.0之间的数字？介于两者之间的数字可以浮动或整数。

What is the regular expression to allow for numbers between -90.0 and +90.0? The numbers in between can be floating or whole numbers.

推荐答案

我不认为你想使用正则表达式这一点。使用（或）如果您的数据存储在一个字符串，然后检查结果值，以确保它落在理想范围内。例如：

I don't think you want to use a Regex for this. Use Double.Parse() (or Double.TryParse()) if your data is stored in a string, and then check the resulting value to ensure that it falls within the desired range. For example:

public bool IsInRange(string value)
{
   bool isInRange = false;

   double parsed = 0;
   if (Double.TryParse(value, out parsed))
   {
      // use >= and <= if you want the range to be from -90.0 to 90.0 inclusive
      isInRange = value > -90.0 && value < 90.0;
   }

   return isInRange;
}

如果你的价值已经是双击，那么它更容易 - 不需要解析

If your value is already a double, then it's even easier -- no parsing required.

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