Java经典实例:在文本中匹配换行符

来源:转载

默认情况下,正则表达式 ^ 和 $ 忽略行结束符,仅分别与整个输入序列的开头和结尾匹配。如果激活 MULTILINE 模式,则 ^输入的开头行结束符之后(输入的结尾)才发生匹配。处于 MULTILINE 模式中时,$ 仅在行结束符之前输入序列的结尾处匹配。

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();

}

}

}

 

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