title: Strings having at-least one character but not just a specific one
body: <p>I've tried searching around for answers but could not easily find one on SO. Please re-direct if this is a repeat question:</p>
  
  <p>Need to ensure strings are valid with:
  <code>[\p{L}\p{N}+-]+</code></p>
  
  <p>Now this ensures the strings will have at-least of one valid unicode letters, a number or the symbols + and -</p>
  
  <p>I have a specific scenario where I do not want the string to contain just + and - </p>
  
  <p>These symbols should be allowed only if the are preceded or succeeded by a valid letter or a number.</p>