using System;
using System.Text.RegularExpressions;
public class Example
{
    public static void Main()
    {
        string pattern = @"(?<=>)\s*([^<]*[^\s<])\s*(?=<)|(?<=>)\s*";
        string substitution = @"$1";
        string input = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<note>
    <to>Tove</to>
    <from>Jani</from>
    <heading> * + Reminder + * </heading>
    <body>Don't forget
        me this weekend!        
    </body>
</note> 
";
        RegexOptions options = RegexOptions.Multiline;
        
        Regex regex = new Regex(pattern, options);
        string result = regex.Replace(input, substitution);
    }
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx