line encoding

I solved this problem with for 

somebody solved this one with reguar expression



Given a string, return its encoding defined as follows:
  • First, the string is divided into the least possible number of disjoint substrings consisting of identical characters
    • for example, "aabbbc" is divided into ["aa", "bbb", "c"]
  • Next, each substring with length greater than one is replaced with a concatenation of its length and the repeating character
    • for example, substring "bbb" is replaced by "3b"
  • Finally, all the new strings are concatenated together in the same order and a new string is returned.
Example
For s = "aabbbc", the output should be
lineEncoding(s) = "2a3bc".
Input/Output
  • [execution time limit] 3 seconds (java)
  • [input] string s
    String consisting of lowercase English letters.
    Guaranteed constraints:
    4 ≤ s.length ≤ 15.
  • [output] string
    Encoded version of s.
[Java] Syntax Tips
// Prints help message to the console
// Returns a string
// 
// Globals declared here will cause a compilation error,
// declare variables inside the function instead!
String helloWorld(String name) {
    System.out.println("This prints to the console when you Run Tests");
    return "Hello, " + name;
}

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