How do I use Java Regex to find all repeating character sequences in a string?

Question

Parsing a random string looking for repeating sequences using Java and Regex.

Consider strings:

aaabbaaacccbb

I\'d like to find a regular expression

Answer 1

You could disregard overlap.

// overlapped 1 or more chars
(?=(\w{1,}).*\1)
// overlapped 2 or more chars
(?=(\w{2,}).*\1)
// overlapped 3 or more chars, etc ..
(?=(\w{3,}).*\1)

Or, you could consume (non-overlapped) ..

// 1 or more chars
(?=(\w{1,}).*\1) \1
// 2 or more chars
(?=(\w{2,}).*\1) \1
// 3 or more chars, etc ..
(?=(\w{3,}).*\1) \1