java正则表达式怎么写

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternDemo {
/**
* @param args
*/
public static void main(String[] args) {
String str = ",a b c,a,c";
Pattern pattern = Pattern.compile("a[^,]*c");
Matcher matcher = pattern.matcher(str);
while(matcher.find()){
System.out.println(matcher.group());
}
}
}

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