title: How can I replace "XX,XXX" with "XX XXX"?
body: <p>I need to replace string like "XX,XXX" with "XX XXX". The string "XX,XXX" is in another string, e.g: </p>
  
  <pre><code>"-1299-5,"XXX,XXXX",trft,4,0,10800"
  </code></pre>
  
  <p>The string is fetched from a text file. I want to split the string by ",". But the comma in the substring led to the wrong result. </p>
  
  <p>The X represents a char. I think regex can help, who can give me the right regex expression. </p>