Split string into repeated characters

by

Try this:

String   str = "aaaabbbccccaaddddcfggghhhh";
String[] out = str.split("(?<=(.))(?!\\1)");

System.out.println(Arrays.toString(out));
=> [aaaa, bbb, cccc, aa, dddd, c, f, ggg, hhhh]

Explanation: we want to split the string at groups of same chars, so we need to find out the “boundary” between each group. I’m using Java’s syntax for positive look-behind to pick the previous char and then a negative look-ahead with a back reference to verify that the next char is not the same as the previous one. No characters were actually consumed, because only two look-around assertions were used (that is, the regular expresion is zero-width).

More Related Contents:

  1. How to split a string if any chracter is found in java
  2. Split string to equal length substrings in Java
  3. Split string with dot as delimiter
  4. Splitting on comma outside quotes
  5. Java string split with “.” (dot) [duplicate]
  6. Splitting a string at every n-th character
  7. How to split String with some separator but without removing that separator in Java? [duplicate]
  8. Extracting pairs of words using String.split()
  9. Java String.split() Regex
  10. Split a string, at every nth position
  11. Java String.split() sometimes giving blank strings
  12. How to Split a mathematical expression on operators as delimiters, while keeping them in the result?
  13. Java split is eating my characters
  14. Java replace all square brackets in a string
  15. Java String split removed empty values
  16. Split Java String by New Line
  17. Regex to match a C-style multiline comment
  18. How to split a string in Java
  19. string to string array conversion in java
  20. Java – Best way to grab ALL Strings between two Strings? (regex?)
  21. How do I convert CamelCase into human-readable names in Java?
  22. Check and extract a number from a String in Java
  23. What is the simplest way to convert a Java string from all caps (words separated by underscores) to CamelCase (no word separators)?
  24. Remove all empty lines
  25. Java: String split(): I want it to include the empty strings at the end [duplicate]
  26. Split string into sentences
  27. Java split String performances
  28. Java String ReplaceAll method giving illegal repetition error?
  29. Find all words with 3 letters with regex
  30. Java equivalent to Explode and Implode(PHP) [closed]

Leave a Comment