title: Check if a specific string contains any lower/uppercase
body: <p>Is there a way to check if a <strong>specific</strong> string contains any lower/upper case ?</p>
  
  <p>E.G :</p>
  
  <pre><code>String myStr = "test";
  if (myStr.contains("test") { // I would like this condition to 
                                  check the spell of "test", weather it is
                                  written like "Test" or "teSt" etc...
  //Do stuff
  }
  </code></pre>
  
  <p>With this syntax, it works only for the exact same string. How could I make my condition for anyform of "test", like : "Test", "tEst", "tesT" etc... ?</p>