Question

我需要在文本行字段中找到数字/双精度并返回其值。文本行可以是这样的：＆＃34; asdajkj asdk asdkj 10.1 asdasd＆＃34; 所以我想要从这一行返回10.1的值。

Answer 1

试试这个： -

string yourString = "asdajkj asdk asdkj 10.1 asdasd";
var resultString = Regex.Match(yourString, @"-?\d+(\.?\d+)?").Value;

更多： -

string yourString = "asdajkj asdk asdkj 10.1 asdasd";
string firstOccurance = Regex.Match(yourString, @"-?\d+(\.?\d+)?").Value;
Console.WriteLine(firstOccurance);

/* Multiple Occurance */
string yourString_2 = "asdajkj 10 asdk 23.26 asdkj 10.1 asdasd 15 ";
MatchCollection results = Regex.Matches(yourString_2, @"-?\d+(\.?\d+)?");
foreach (Match item in results)
{
    Console.WriteLine(item.Value);
}

Answer 2

string input = "sdajkj asdk asdkj 10.1 asdasd";

// Split on one or more non-digit characters.
string[] numbers = Regex.Split(input, @"\D+");

Answer 3

从字符串中获取第一个数字。

Regex.Match(yourString, @"(?<=^\D*)\d+(?:\.\d+)?").Value

Answer 4

你不需要Regex来做到这一点：

string input = "asdajkj asdk asdkj 10.1 asdasd";

string res = new string(input.SkipWhile(c => !Char.IsDigit(c)).TakeWhile(c => Char.IsDigit(c) || c == '.').ToArray());

Console.WriteLine(res); // 10.1

在正则表达式中查找文本行中的数字和双精度数

4 个答案: