Java 正则表达式中的反斜杠

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import java.util.regex.Matcher;

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import java.util.regex.Pattern;

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public class Main {

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  public static void main(String[] argv) {

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    String rep = "a\\\\b";

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    String input = "> XYZ <=> ABC <";

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    Pattern pattern = Pattern.compile("ABC|XYZ");

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    Matcher matcher = pattern.matcher(input);

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    System.out.println(matcher.replaceFirst(rep));

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    System.out.println(matcher.replaceAll(rep));

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    rep = "\\\\r\\\\n";

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    input = "line 1\nline 2\nline 3\n";

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    pattern = Pattern.compile("\\n");

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    matcher = pattern.matcher(input);

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    System.out.println("");

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    System.out.println("Before:");

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