Extracting substring with regexp

How to extract substring with regexp when we have start and end for
substring?
For example I want to find what is between "abc" and "xyz" in the
String.

Pattern p = Pattern.compile("abc*xyz");
Matcher m = p.matcher("aaaaaaaaaabc123xyzzzzzzzzzzzzz");

but m.matches() returns false and can't find my patter.

How can I get these "123" in this example?

Alex Kizub.
.