How to Select certain String that is under the Mouse Cursor in C#-wpf?

I'm working on a project which is in the C# language. 开发者_如何学GoMy question is: How can I detect the string which is under the Mouse Cursor and is between the "(" and ")"?

For example: I want to highlight "yahoo" in a textbox with this content when the mouse is over it: google(1) yahoo(2) apple(3) microsoft(4) ...

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Edit

The following code will select the word directly under the Mouse

Xaml

<TextBox MouseMove="TextBox_MouseMove"
         Text="Google(1) yahoo(2) apple(3) microsoft(4)"/>

Code behind

private void TextBox_MouseMove(object sender, MouseEventArgs e)
{
    TextBox textBox = sender as TextBox;
    Point mousePoint = Mouse.GetPosition(textBox);
    int charPosition = textBox.GetCharacterIndexFromPoint(mousePoint, true);
    if (charPosition > 0)
    {
        textBox.Focus();
        int index = 0;
        int i = 0;
        string[] strings = textBox.Text.Split(' ');
        while (index + strings[i].Length < charPosition && i < strings.Length)
        {
            index += strings[i++].Length + 1;
        }
        textBox.Select(index, strings[i].Length);
    }
}

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Very interesting problem, I don't know the answer right away, there are similar questions around, not a solution out of the box but if you work it out and let it inspire you, a solution could be possible:

Get Displayed Text from TextBlock

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You can split up the text into multiple TextBlock runs... just like you would in a web site (using spans)... then you can tap into the MouseOver events in the styleing.

Example:

<TextBox>
    <TextBox.Text>
        <TextBlock Text="google" />
        <TextBlock Text="(1) " />

        <TextBlock Text="yahoo" />
        <TextBlock Text="(2) " />

        <TextBlock Text="apple" />
        <TextBlock Text="(3) " />

        <TextBlock Text="microsoft" />
        <TextBlock Text="(4) " />
    </TextBox.Text>
</TextBox>

Then add styling for the IsMouseOver of the textblocks that you want. (You can do this all in code as well).