title: java add character into a string
body: <p>i get a big string from a web page and its like this        </p>
  
  <pre><code>"07:10Ο ΑΣΔΦΑΣΔΦ07:30ΑΣΔΦΑΣΔΦ10:15ΝΑΣΔΦΑΣΔΦ"
  </code></pre>
  
  <p>and i want every time i find time like this "17:50" or "07:30" to get a new line before the time! so i will have</p>
  
  <pre><code>07:10   ΑΣΔΦΑΣΔΦ
  07:30   ΑΣΔΦΑΣΔΦ
  10:15   ΝΑΣΔΦΑΣΔΦ
  </code></pre>
  
  <p>etc...</p>
  
  <p>but here is my problem i tried to copmare the letters with this</p>
  
  <pre><code>StringBuilder builder = new StringBuilder(text);
  for (int i = 0; i &lt; text.length(); i++) {
       if(Character.isDigit(text.charAt(i))){
              builder.insert(i, "\n");
       }
  }
  </code></pre>
  
  <p>but inside my text i have Greek letters so the isDigit returns 1 when it gets some Greek letters. Anyone has any idea how to solve this?</p>