我需要找到并提取字符串中包含的数字。
例如,从这些字符串:
string test = "1 test"
string test1 = " 1 test"
string test2 = "test 99"
我该怎么做呢?
我需要找到并提取字符串中包含的数字。
例如,从这些字符串:
string test = "1 test"
string test1 = " 1 test"
string test2 = "test 99"
我该怎么做呢?
当前回答
static string GetdigitFromString(string str)
{
char[] refArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
char[] inputArray = str.ToCharArray();
string ext = string.Empty;
foreach (char item in inputArray)
{
if (refArray.Contains(item))
{
ext += item.ToString();
}
}
return ext;
}
其他回答
基于上一个示例,我创建了一个方法:
private string GetNumberFromString(string sLongString, int iLimitNumbers)
{
string sReturn = "NA";
int iNumbersCounter = 0;
int iCharCounter = 0;
string sAlphaChars = string.Empty;
string sNumbers = string.Empty;
foreach (char str in sLongString)
{
if (char.IsDigit(str))
{
sNumbers += str.ToString();
iNumbersCounter++;
if (iNumbersCounter == iLimitNumbers)
{
return sReturn = sNumbers;
}
}
else
{
sAlphaChars += str.ToString();
iCharCounter++;
// reset the counter
iNumbersCounter = 0;
}
}
return sReturn;
}
使用上面的@tim-pietzcker回答,以下将适用于PowerShell。
PS C:\> $str = '1 test'
PS C:\> [regex]::match($str,'\d+').value
1
var match=Regex.Match(@"a99b",@"\d+");
if(match.Success)
{
int val;
if(int.TryParse(match.Value,out val))
{
//val is set
}
}
下面是Linq版本:
string s = "123iuow45ss";
var getNumbers = (from t in s
where char.IsDigit(t)
select t).ToArray();
Console.WriteLine(new string(getNumbers));
遍历字符串并使用Char。IsDigit
string a = "str123";
string b = string.Empty;
int val;
for (int i=0; i< a.Length; i++)
{
if (Char.IsDigit(a[i]))
b += a[i];
}
if (b.Length>0)
val = int.Parse(b);