title: How to validate "Hangul-Korean" text?
body: <p>I want to validate a "Hangul-Korean" text in java.</p>
  
  <p>I will be having the "Korean" text in the "String" and calling "matches()" i will be validating the string.</p>
  
  <p>The regular expression is to test whether that text is "Korean" and that Korean string characters length is in some range like 10 to 20.</p>
  
  <p>I don't want to use any other third party solutions.</p>
  
  <p>Thanks in advance.</p>