Ask: Replace multiple new line into single new line or br

I have problem with replace character.

If I have one textbox, and I write into textbox with many new line.

and the results I wanted a lot of new lines replaced with one or two new lines such as comments in the facebook.

I'l try this code :

litText.Text = System.Text.RegularExpressions.Regex.Replace(Text1.Text, "[\\r\\n]+", "<br /><br />", System.Text.RegularExpressions.RegexOptions.Multiline); 

this works if I press a lot of button enter,but this isn't works if I press button enter once then displays new line twice开发者_如何学编程. I want if I press once or two button enter, fixed display once or two new line. except three times or more than two.

please your assistance and your opinions.

Thank you

You want to duplicate the entire \r\n multiple times, as opposed to just duplicating one of them like in your example. Also you should use @"..." for this.

litText.Text = System.Text.RegularExpressions.Regex.Replace(
    Text1.Text, @"(\r\n|\r|\n)+", "<br>", 
    System.Text.RegularExpressions.RegexOptions.Multiline);