在richtextbox中查找单词 [英] Find words in richtextbox

问题描述

我正在使用以下代码在richtext框中搜索文本：

I'm using the following code to search for text in a richtext box:

richTextBox1.Find(textBox1.Text, index, richTextBox1.TextLength, RichTextBoxFinds.None);

如果我输入：

textbox1：int



richtextbox1内容突出显示如下：

if I input:
textbox1 : int

the richtextbox1 content is highlighted like below:

richtextbox1: You are intelligent but intimidating

但我希望突出显示如下相同的输入in textbox1：

but I want the highlighting to be as follows for the same input in textbox1 :

You are intelligent but intimidating.

请指教..谢谢..

Please advice.. Thank you..

推荐答案

private void button1_Click(object sender, EventArgs e)
       {
           selectWords(richTextBox1.Text, textBox1.Text);
       }

       private void selectWords(string fullText, string searchText)
       {
           string[] words = fullText.Split(' ');
           foreach (var word in words)
           {
               if (word.Contains(searchText))
               {
                   richTextBox1.Find(word, 0, richTextBox1.TextLength, RichTextBoxFinds.None);
                   richTextBox1.SelectionBackColor = Color.Green;
               }
           }
       }

我不知道确切原因solution1没有突出显示实际的searchtext。可能每次使用零（0）作为find方法的起始索引。因此我修改如下。

Hi,
I dont know the exact reason why solution1 is not highlighting actual searchtext. May be using every time zero(0) as starting index in find method. Hence i modified as below.

string[] words = fullText.Split(' ');
           int index = 0;
           foreach (var word in words)
           {
               if (word.Contains(searchText))
               {
                   index = richTextBox1.Find(word, index, richTextBox1.TextLength, RichTextBoxFinds.None);
                   richTextBox1.SelectionBackColor = Color.Green;
                   index++;
               }
           }

你可以尝试正则表达式

这个表达式只适用于小写字母。

You can try regular expression
This expression will only work for lower case letters.

textBox1.Text = @"int\w*";

这是表格中的假定功能

This is an assumed function in your Form

private void buttonHighLight_Click(object sender, EventArgs e)
{
   // If the input contains the regular expression part
   HighLightWords(textBox1.Text);
   // or if you don't want the user to deal with regular expressions, you can add this part in code.
   HighLightWords(String.Format(@"{0}\w*", textBox1.Text);
}

这将突出显示与输入表达式匹配的任何单词。

This will highlight any word that matches the input expression.

private void HighLightWords(string wordExpression)
{
    Regex regex = new Regex(wordExpression, RegexOptions.CultureInvariant | RegexOptions.Singleline);
    foreach (Match m in regex.Matches(richTextBox1.Text))
    {
        richTextBox1.SelectionStart = m.Index;
        richTextBox1.SelectionLength = m.Length;
        richTextBox1.SelectionBackColor = Color.Yellow;
    }
}

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