title: How to remove unicode.OtherSymbol from a string
body: <p>I'm trying to remove characters like ✅⛱⛄ from a given string. These characters belong to <code>UnicodeCategory.OtherSymbol</code>, but <code>char.GetUnicodeCategory</code> returns <code>UnicodeCategory.Surrogate</code>. </p>
  
  <p>If I just want to remove those emotion/picture characters from a string and leave other surrogate characters untouched, what should I do?</p>
  
  <p>I've tried <code>Regex.IsMatch("", @"\p{So}")</code>, didn't work.</p>