正则表达式的数字只 [英] Regex for numbers only

问题描述

我没有使用常规的前pressions可言，所以我有困难的故障排除。我要匹配的正则表达式，只有当所包含的字符串是所有的数字;但它下面的两个例子是匹配包含字符串的所有数字加一个等号，如1234 = 4321。我敢肯定有一种方法来改变这种行为，但正如我所说，我从来没有真正做了很多与常规的前pressions。

I haven't used regular expressions at all, so I'm having difficulty troubleshooting. I want the regex to match only when the contained string is all numbers; but with the two examples below it is matching a string that contains all numbers plus an equals sign like "1234=4321". I'm sure there's a way to change this behavior, but as I said, I've never really done much with regular expressions.

string compare = "1234=4321";
Regex regex = new Regex(@"[\d]");

if (regex.IsMatch(compare))
{ 
    //true
}

regex = new Regex("[0-9]");

if (regex.IsMatch(compare))
{ 
    //true
}

在它的事项，我使用C＃和.NET2.0案例

In case it matters, I'm using C# and .NET2.0.

推荐答案

使用的开始和结束锚。

Regex regex = new Regex(@"^\d$");

使用^ \\ D + $如果你需要匹配多个数字。

Use "^\d+$" if you need to match more than one digit.

注意\\ D将匹配 [0-9] 和其他数字字符，如东方阿拉伯语数字 0123456789 。使用^ [0-9] + $来限制比赛只是阿拉伯数字0 - 9

Note that "\d" will match [0-9] and other digit characters like the Eastern Arabic numerals ٠١٢٣٤٥٦٧٨٩. Use "^[0-9]+$" to restrict matches to just the Arabic numerals 0 - 9.

如果你需要包括任何数字再$ P $不仅仅是个数字（如对于初学者十进制值）等psentations，然后看看 @ tchrist 的 COM prehensive指导与常规的前pressions 的分析数字。

If you need to include any numeric representations other than just digits (like decimal values for starters), then see @tchrist's comprehensive guide to parsing numbers with regular expressions.

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