使用C＃正則表達式獲取兩個單詞之間的字符串

Question

我想在兩個字符串之間獲取文本。 為此，我嘗試了以下代碼。

string q = "SELECT \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\".\"CUSTOMER_ID\" FROM \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\"";
        Regex regex = new Regex("SELECT(.*)FROM");
var result = regex.Match(q).Value;

輸出 ：SELECT \\“ NORTHWIND \\”。\\“ CUSTOMER_DETAILS_NORTHWIND \\”。\\“ CUSTOMER_ID \\” FROM

但是我期望沒有SELECT和FROM關鍵字的結果。

預期輸出： \\“ NORTHWIND \\”。\\“ CUSTOMER_DETAILS_NORTHWIND \\”。\\“ CUSTOMER_ID \\”

誰能建議我如何實現這一目標？

Answer 1

string input = "SELECT \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\".\"CUSTOMER_ID\" FROM \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\"";

Regex regex = new Regex("SELECT(.*)FROM");
var result = regex.Match(input);
var output = result.Groups[1].ToString();

Answer 2

var match = Regex.Match(s, @"(?i)SELECT\s+(.+?)\s+FROM");
if (match.Success)  {
    Console.WriteLine(match.Groups[1].Value);
}

Answer 3

您也可以不使用RegEx 。

public static string GetBetweenTwoWords(string firstWord,string secondWord,string str){
    var firstWordIndex = str.IndexOf(firstWord) + firstWord.Length;
    var secondWordIndex = str.IndexOf(secondWord);
    return str.Substring(firstWordIndex,secondWordIndex - firstWordIndex);
}

測試：

static void Main(string[] args)
{
    string q = "SELECT \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\".\"CUSTOMER_ID\" FROM \"NORTHWIND\".\"CUSTOMER_DETAILS_NORTHWIND\"";
    Console.WriteLine(GetBetweenTwoWords("SELECT","FROM",q));

}

輸出：

"NORTHWIND"."CUSTOMER_DETAILS_NORTHWIND"."CUSTOMER_ID"

Answer 4

干得好：

  "SELECT\s+\K\\".*(?=\sFROM)

無需捕獲組，只需進行正則表達式匹配即可（您也可以刪除“ SELECT \\ s +”（這只是額外的驗證）