CODEWITHSUNDEEP
c#regexrichtextbox
Roshan
Roshan

Reputation: 83

c# Highlight the rtb text colour based on regex

I have question using rtb and regex together.

I have a text like vK-lKs-812349;jra_6993788428;Enx-2674@62

My function will split the data by deli'ter ';' and matches each part with regex patterns

What I want is I have this data in line in rtb (all line have a similar data i.e, same pattern of data). When I Click a button function should get the line in which the cursor is and it should match the pattern and if regex doesn't match it should change the color of that particular part of text.

Example: If I'm in line 2 and the 2nd part data is 'zza 6993788428' then as there is _ missing regex will not be match so I want that this part in the rtb should get the color red.

Your help will be appreciated. Thanks...

Upvotes: 1

Views: 268

Answers (3)

Roshan
Roshan

Reputation: 83

I found code for this question by myself. I created a timer that gets the line no from the rtb and puts in a global variable.

            timer1.Start();
        timer1.Tick += new EventHandler(LineEvent);

and the global variable and events are

        public static class foo
    {
        public static int lineno;
    }

        private void LineEvent(object sender, EventArgs eArgs)
    {
        int IndexCoun = rtb1.SelectionStart;//Index count where actually the mouse is clicked in the richtextbox
        foo.lineno = rtb1.GetLineFromCharIndex(IndexCoun);//Get the line no
    }

And the main function that matches the function and changes the rtb is 

        private void RegexCla(string value, string pattern, string data)
    {
        if(Regex.IsMatch(value, pattern) == true)
        {
            int index = 0;
            for (int i = 0; i < foo.lineno; i++)
            {
                int gelen = rtb1.Lines[i].Length;
                index = index + gelen;
            }
            rtb1.Find(data, index, RichTextBoxFinds.WholeWord);
            rtb1.SelectionColor = Color.Green;
            rtb1.SelectedText = value;
        }
        else
        {
            int index = 0;
            for (int i = 0; i < foo.lineno; i++)
            {
                int gelen = rtb1.Lines[i].Length;
                index = index + gelen;
            }
            rtb1.Find(data, index, RichTextBoxFinds.WholeWord);
            rtb1.SelectionColor = Color.Red;
        }
    }

And finally the button click is

        private void RegBtn_Click(object sender, EventArgs e)
    {
        string[] rtblines = rtb1.Lines;
        var reqtext = rtblines[foo.lineno];
        string[] reclis = reqtext.Split(';');
        RegexCla(reclis[0].Replace(" ", ""), "^[a-zA-Z]{2}-[a-zA-Z]{3}-[0-9]{7}$", reclis[0]);
    }

Thanks for all your support @King.

Upvotes: 1

King
King

Reputation: 179

    private void Findword(string FindText, RichTextBox rt)
    {
        try
        {
            List<int> lst = new List<int>();
            bool IsRun = true;
            int Index = 0;
            int count =0;

            lst.Add(-1);
            lst.Add(0);
            lst.Add(rt.TextLength);
            while (IsRun)
            {
                Index = rt.Find(FindText, Index, RichTextBoxFinds.WholeWord);
                if (lst.Contains(Index))
                    break;
                else
                    count++;
                lst.Add(Index);
                Index += FindText.Length;
            }

            MessageBox.Show(FindText + " Count: " + count);
        }
        catch { }
    }

Upvotes: 1

King
King

Reputation: 179

Try this

     if (!string.IsNullOrEmpty(richTextBox1.Text))
            {
                int lineStart = 0;
                foreach (string item in richTextBox1.Lines)
                {
                    List<string> lst = item.Split(new char[] { ';' }).ToList();
                    if (lst.Count == 3)
                    {
                        if (!Regex.IsMatch(lst[1], "^[a-zA-Z]{3}_[0-9]{10}$"))
                        {
                            int Start = richTextBox1.Find(item, lineStart, richTextBox1.TextLength, RichTextBoxFinds.WholeWord);
                            int End = Start + item.Length;

                            richTextBox1.Select(Start, End);
                            richTextBox1.SelectionBackColor = Color.Red;
                        }
                        else
                        {
                            int Start = richTextBox1.Find(item, lineStart, richTextBox1.TextLength, RichTextBoxFinds.WholeWord);
                            int End = Start + item.Length;

                            richTextBox1.Select(Start, End);
                            richTextBox1.SelectionBackColor = Color.Green;
                        }
                    }
                    lineStart += item.Length;
                }
            }

Upvotes: 1

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