使用C＃正则表达式获取两个单词之间的字符串

Question

I want to get text between two strings. For this, I have tried the below code.

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;

Output : SELECT \\"NORTHWIND\\".\\"CUSTOMER_DETAILS_NORTHWIND\\".\\"CUSTOMER_ID\\" FROM

But I expected result without SELECT and FROM keyword.

Expected Output: \\"NORTHWIND\\".\\"CUSTOMER_DETAILS_NORTHWIND\\".\\"CUSTOMER_ID\\"

Can anyone suggest me how to achieve this?

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

You can do it without RegEx too.

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);
}

Test:

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));

}

Output:

"NORTHWIND"."CUSTOMER_DETAILS_NORTHWIND"."CUSTOMER_ID"

Answer 4

Here you go:

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

no need for capture groups, just take the regex match (you can also remove the "SELECT\\s+ (it's just an extra verification)