title: Match a string containing a comma (eg 1,5)
body: <p>i want to check if the string i take from a Textfield
  has a comma, in order to drop it and ask for a new value with dot.</p>
  
  <p>i try to use </p>
  
  <pre><code>  textTestAr.trim().matches("^[,]+$")     
  </code></pre>
  
  <p>but nothing happens, while this</p>
  
  <pre><code>        ^[1-9,]+$      
  </code></pre>
  
  <p>does the trick, but also matches numbers like 1.</p>