Regular Expression: Multiple replacement in one go

One of the overloaded form of Regex.Replace function takes MatchEvaluator delegate as a parameter. We can use this form to achieve multiple (conditional) replacement in one go.

For Example:

// Replace Textboxes
string regex = "\\
";
System.Text.RegularExpressions.RegexOptions options = ((System.Text.RegularExpressions.RegexOptions.IgnorePatternWhitespace
| System.Text.RegularExpressions.RegexOptions.Multiline)
| System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(regex, options);
pageContent = reg.Replace(pageContent,new MatchEvaluator(RemoveFormElement));

protected string RemoveFormElement(Match m)
{
if(m.Value.IndexOf("RemoveFeedback") != -1)
{
string feedback = Regex.Replace(txtFeedback.Text,"\\n","
");
return ""+feedback+"";
}
else if (m.Value.IndexOf("RemoveContextHeader") != -1)
{
return  ""+ contextHeader +"";
}
else
{
return m.Value;
}

}