Java正则表达式实现在文本中匹配查找换行符的方法【经典实例】

package nlMatch;
import java.util.regex.Pattern;
/**
 * Created by Frank
 * 使用正则表达式在文本中查找换行符
 */
public class NLMatch {
 public static void main(String[] args) {
  String input = "I dream of engines\nmore engines, all day long";
  System.out.println("INPUT:" + input);
  System.out.println();
  String[] patt = {"engines.more engines", "ines\nmore", "engines$"};
  for (int i = 0; i < patt.length; i++) {
   System.out.println("PATTERN:" + patt[i]);
   boolean found;
   Pattern p1l = Pattern.compile(patt[i]);
   found = p1l.matcher(input).find();
   System.out.println("DEFAULT match " + found);
   // .代表任何符号（DOT ALL），
   Pattern pml = Pattern.compile(patt[i], Pattern.DOTALL | Pattern.MULTILINE);
   found = pml.matcher(input).find();
   System.out.println("Multiline match " + found);
   System.out.println();
/*
 运行结果：
 
DEFAULT match true
Multiline match true

PATTERN:engines$
DEFAULT match false
Multiline match true

 */
  }
 }
}