limit « matcher « Java Regex Q&A

1. in matcher.replace method,how to limit replace times?    stackoverflow.com

in matcher.replace method,only has: replaceFirst() and replaceAll() two methods i want limit replace 3 times,how to do? example:

String content="aaaaaaaaaa";

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class T1 {
    ...

2. Java : does regex pattern matcher have a size limit?    stackoverflow.com

My pattern is OR-like : "word1|word2|word3" I have approximately 800 words. Can it be a problem ?