CODEWITHSUNDEEP
javastringjsp
xdefaultx
xdefaultx

Reputation: 45

Removing unused spaces and commas from a string in Java

I have a question, and I'm sure there is a relatively simple answer to this, but at the moment I'm having a massive brain fart and can't seem to think of an elegant solution that doesn't involve a ridiculous myriad of if statements.

Basically, I have a web page that is dynamically updating the users present into a string, stylised as such

User1, User2, User3, User4

However, when I delete one of these users, from a different location, they are removed from the list, but I'm left with the following

Beginning

, User2, User3, User4

Middle

User1, , User3, User4

End

User1, User2, User3,

If anyone knows of a relatively easy way to remove these unwanted commas, that would be really helpful; it's been bugging me for hours.

Upvotes: 3

Views: 3335

Answers (4)

KARASZI István
KARASZI István

Reputation: 31467

I would do a split and then a join.

With Guava:

final Iterable<String> fields = Splitter.on(",")
  .trimResults()
  .omitEmptyStrings()
  .split(data);

final String trimmedData = Joiner.on(",").join(fields);

With this you can even validate the input fields with Iterables.filter if you want.

Upvotes: 1

Alex
Alex

Reputation: 25613

",User1, , User3, User4,".replaceAll("[\\s],|,$|^,", "");

->

User1, User3, User4

Upvotes: 1

EvenLisle
EvenLisle

Reputation: 4812

You could simply try:

String s = "User1, , User2, User3, ,...;
s = s.replaceAll(", ,", ",");

Upvotes: 1

Miquel
Miquel

Reputation: 15675

You could match ,$, ^, and , , with a regex and replace it with empty

Upvotes: 6

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