CODEWITHSUNDEEP
javaarraysregexstringjava-8
Hana
Hana

Reputation: 1470

Regex in Java - parsing a string array

I have a string array like this: 

    String tweetString = ExudeData.getInstance().filterStoppingsKeepDuplicates(tweets.text);
    // get array of words and split
    String[] wordArray = tweetString.split(" ");

After I split the array, I print the following: 

System.out.println(Arrays.toString(wordArray));

And the output I get is: 

[new, single, fallin, dropping, days, artwork, hueshq, production, iseedaviddrums, amp, bigearl7, mix, reallygoldsmith, https, , , t, co, dk5xl4cicm, https, , , t, co, rvqkum0dk7]

What I want is to remove all the instances of commas, https, and single letters like 't' (after using split method above). So I want to end up with this: 

[new, single, fallin, dropping, days, artwork, hueshq, production, iseedaviddrums, amp, bigearl7, mix, reallygoldsmith, co, dk5xl4cicm, https, co, rvqkum0dk7]

I've tried doing replaceAll like this: 

String sanitizedString = wordArray.replaceAll("\\s+", " ").replaceAll(",+", ",");

But that just gave me the same initial output with no changes. Any ideas?

Upvotes: 1

Views: 132

Answers (3)

Youcef LAIDANI
Youcef LAIDANI

Reputation: 60046

If you are using Java 8

String[] result = Arrays.stream(tweetString.split("\\s+"))
            .filter(s -> !s.isEmpty())
            .toArray(String[]::new);

What I want is to remove all the instances of commas, https, and single letters like 't'

In this case you can make multiple filters like @Andronicus do or with matches and some regex like so :

String[] result = Arrays.stream(tweetString.split("\\s+"))
            .filter(s -> !s.matches("https|.|\\s+"))
            .toArray(String[]::new);

Upvotes: 2

Optional
Optional

Reputation: 4517

Based on my comment here is quick solution. (Enhance the regex with all your keywords)

 private static void replaceFromRegex(final String text ) {
    String result = text.replaceAll("https($|\\s)| (?<!\\S)[^ ](?!\\S)","");
      System.out.println(result);
  }

and then test

  public static void main(String []args) throws Exception{
      replaceFromRegex("new single fallin dropping, , https");
     }

Note: This is just sample and you will have to enhance regex to consider starting word (e.g string starting with https and then space, etc)

Upvotes: 1

Andronicus
Andronicus

Reputation: 26076

You can do something like this:

String[] filtered = Arrays
    .stream(tweetString.split("[ ,]"))
    .filter(str -> str.length() > 1)
    .filter(str -> !str.equals("http"))

Upvotes: 1

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