正则表达式模式1到2 [英] Regex Pattern number1 to number2

问题描述

我正在搜索以下行为的模式:

I'm searching for a pattern for the following behavior:

number1-number2
number1: Can be everything >= 0 and <= int.MaxValue
number2: Can be everything >= number1 and <= int.MaxValue

例如

"1-2" => True
"0-0" => True
"10-22" => True
"22-10" => False
"10-10" => True
"a-b" => False

如果我可以直接提取两个int值，那也很好.

It would be also nice if I could directly extract the two int values.

推荐答案

您不能使用正则表达式比较提取的数字.您需要使用 int.TryParse 解析值，并实施其他检查以获取所需的内容.

You cannot use a regex for comparing extracted numbers. You need to parse the values with int.TryParse and implement other checks to get what you need.

假设范围内只有 整数正数 ，则为 String.Split 和 int.TryParse 方法:

Assuming you only have integer positive numbers in the ranges, here is a String.Split and int.TryParse approach:

private bool CheckMyRange(string number_range, ref int n1, ref int n2)
{
    var rng = number_range.Split('-');
    if (rng.GetLength(0) != 2) 
       return false;

    if (!int.TryParse(rng[0], out n1))
       return false;
    if (!int.TryParse(rng[1], out n2))
       return false;
    if (n1 >= 0 && n1 <= int.MaxValue)
       if (n2 >= n1 && n2 <= int.MaxValue)
           return true;
    return false;
}

像这样称呼

int n1 = -1;
int n2 = -1;
bool result = CheckMyRange("1-2", ref n1, ref n2);

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