Use regex to remove unwanted commas

Question

I am creating an application in which I created a line as follows:

 hihibjj,,,,,,,ghjjjj, , ,[e-mail],,,,[e-mail], [e-mail], [e-mail]

I want to remove unnecessary commas, only separate values ​​should be present, separated by a comma.

The code I tried

for (int i = 0; i < temp.length; i++) {
  for (int j = 0; j < emailSeperated.size(); j++) {
    if (temp[i].trim().equals(emailSeperated.get(j).trim())) {
      strEmailValue = strEmailValue.replace(temp[i], "").trim();
      Log.e("strEmail trimmed value", strEmailValue);
    } else if (temp[i].trim().equals(emailSeperated.get(j).trim())) {
      strEmailValue = strEmailValue.replaceAll(temp[i] + ",", "").trim();
    }
  }
} 

Answer 1

You can also use lookbehind.

Regex:

(?<=,) ?,

Replaced string:

Empty string

Demo

System.out.println("hihibjj,,,,,,,ghjjjj, , ,[e-mail],,,,[e-mail], [e-mail], [e-mail]".replaceAll("(?<=,) ?,", ""));

Conclusion:

hihibjj,ghjjjj,[e-mail], [e-mail], [e-mail], [e-mail] 

Answer 2

Just find: ,,+and replace with:,

Answer 3

String as = "as,,,,,,";
as= as.replaceAll(",,+",",");