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String strs[] = { "ababba", "bbababbaaabbababb","bbababbaaabbbababb", "cbababbaaabbbabaaab" };
String ptn = "\\b((?!bbb)[ab])+\\b";
for (int i = 0; i < strs.length; i++) {
Pattern p = Pattern.compile(ptn);
Matcher m = p.matcher(strs[i]);
if (m.find()) {
System.out.println("i:"+i+" "+ strs[i]);
}
}