What is the most useful String helper that you've encountered? [closed]

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What useful helpers for String manipulation to you have to share?

I once wrote a replacement for String.Format(), which I find much more neat to use:

public static class StringHelpers
{
    public static string Args(this string str, object arg0)
    {
        return String.开发者_StackOverflow社区Format(str, arg0);
    }

    public static string Args(this string str, object arg0, object arg1)
    {
        return String.Format(str, arg0, arg1);
    }

    public static string Args(this string str, object arg0, object arg1, object arg2)
    {
        return String.Format(str, arg0, arg1, arg2);
    }

    public static string Args(this string str, params object[] args)
    {
        return String.Format(str, args);
    }
}

Example:

// instead of String.Format("Hello {0}", name) use:
"Hello {0}".Args(name)

What other useful helpers do you have for strings in C#?

---

A fairly popular one that is more of a convenience extension method is the following:

public static class StringExtensions
{
    public static bool IsNullOrEmpty(this string s)
    {
        return String.IsNullOrEmpty(s);
    }
}

Nothing great, but writing myString.IsNullOrEmpty() is more convenient than String.IsNullOrEmpty(myString).