CODEWITHSUNDEEP
c#stringbetween
user3549561
user3549561

Reputation: 11

Between two strings, but first string must be last occurrence

public static string Between(this string value, string a, string b)
{
    int posA = value.IndexOf(a);
    int posB = value.LastIndexOf(b);

    if (posA == -1)
    {
        return "";
    }

    if (posB == -1)
    {
        return "";
    }

    int adjustedPosA = posA + a.Length;

    if (adjustedPosA >= posB)
    {
        return "";
    }

    return value.Substring(adjustedPosA, posB - adjustedPosA);
}


//Button1 Click
MessageBox.Show(Between("Abcdefgh- 50- 25------------ 37,50-#", "- ", "-#"));

The result is: 50- 25------------ 37,50. But I want to select last '- '. So the result must be 37,50.

Can anyone help me?

Upvotes: 0

Views: 202

Answers (1)

Josh
Josh

Reputation: 2339

I'd use Regex.

public static string Between(this string value, string a, string b)
{
    return Regex.Match(value, string.Format("((?:(?!{0}).)*){1}", Regex.Escape(a), Regex.Escape(b))).Groups[1].Value;
}

The regex is looking for the last occurrence of a before b and selects the characters between them.

Adapted from: https://stackoverflow.com/a/18264730/134330

Upvotes: 3

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