title: How to validate EditText input with a custom regex in Android?
body: <p>I am new to android development and also regular expression. I am able to retrieve inputs from user through the EditText and check if it's empty and later display the error message if it is empty but I am not sure on how to check with a custom regex. Here's my code : </p>
  
  <pre><code> myInput = (EditText) findViewById(R.id.myInput);
  String myInput_Input_a = String.valueOf(myInput.getText());
  
  //replace if input contains whiteSpace
  String myInput_Input = myInput_Input_a.replace(" ","");
  
  
      if (myInput_Input.length()==0 || myInput_Input== null ){
  
                 myInput.setError("Something is Missing! ");
       }else{//Input into databsae}
  </code></pre>
  
  <p>So, im expecting the user to input a 5 character long string where the first 2 letters must be numbers and the last 3 characters must be characters. So how can i implement it people ? </p>