使用C＃正则表达式获取两个单词之间的字符串

Question

我想在两个字符串之间获取文本。 为此，我尝试了以下代码。

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;

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

但是我期望没有SELECT和FROM关键字的结果。

预期输出： \\“ NORTHWIND \\”。\\“ CUSTOMER_DETAILS_NORTHWIND \\”。\\“ CUSTOMER_ID \\”

谁能建议我如何实现这一目标？

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);
}

测试：

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));

}

输出：

"NORTHWIND"."CUSTOMER_DETAILS_NORTHWIND"."CUSTOMER_ID"

Answer 4

干得好：

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

无需捕获组，只需进行正则表达式匹配即可（您也可以删除“ SELECT \\ s +”（这只是额外的验证）