c# - 获取字符串中的星期几

Question

我有一个输出字符串，它将包含一个工作日（星期一、星期二等）。

例如，

"Some tex may appear before week day, Monday, will only be one occurrence of the weekday"

如何从字符串中检索工作日？

我可以使用 IF 语句链来查看字符串是否包含工作日，但想知道是否有更简洁的方法？

Answer 1

这将构建一个正则表达式，它将找到一周中的某一天。

var pattern = string.Format("({0})", string.Join("|", Enum.GetValues(typeof (DayOfWeek)).OfType<DayOfWeek>()));

var match = Regex.Match("some text here, Thursday maybe text here", pattern, RegexOptions.IgnoreCase);

Assert.AreEqual("Thursday", match.Value);

Answer 2

我会做一些寻找当天索引的事情，然后从那里拉出来。就像是：

int first = str.IndexOf("Thursday");
int last = str.LastIndexOf("Thursday");
string day = str.Substring(first, last);

代码可能不是 100% 正确，但类似的东西应该可以工作。如果超过一天，您显然必须每天都这样做。

Answer 3

检查它是否存在于字符串中

string text = "some text here, Thursday maybe text here";

if (text.Contains("thursday")) // Make text to lower case before checking
{
    ...
}

删除它

text = text.Replace("thursday", ""); // Regex would be better to make it case-insensitive

一周中的所有日子都这样做。

Answer 4

假设不考虑这种情况并且只发生一种情况：

string found = "";

string myString = "some text here, Thursday maybe text here";

foreach (string str in myString.Split())

    foreach (DayOfWeek day in Enum.GetValues(typeof(DayOfWeek)))

        if(day.ToString() == str) found = str;

Answer 5

int intCounter = 0;
string strWeekName = "";
string strContent = "Some text wednesday";
strContent = strContent.ToUpper;
while (intCounter < 7) {
  if (strContent.Contains(DateAndTime.WeekdayName(intCounter).ToUpper())) {
      strWeekName = DateAndTime.WeekdayName(intCounter);
      break; 
  }
  intCounter++; 
}

MsgBox "Weekday " + strWeekName;