解决方案
以下示例显示了如何使用 regex.Matcher 类的 p.matcher() 方法和 m.group() 方法在正则表达式中搜索重复的单词。
import java.util.Scanner;
import java.io.*;
import java.util.regex.*;
import java.util.ArrayList;
public class dupl {
public static void main(String[] args) {
ArrayList <String> manyLines = new ArrayList<String>();
ArrayList <String> noRepeat = new ArrayList<String>();
try {
String s1 = "Hello hello Hello there there past pastures ";
Scanner myfis = new Scanner(s1);
while(myfis.hasNext()) {
String line = myfis.nextLine();
String delim = System.getProperty("line.separator");
String [] lines = line.split(delim);
for(String s: lines) {
if(!s.isEmpty() && s != null) {
manyLines.add(s);
}
}
}
if(!manyLines.isEmpty()) {
System.out.print("Original text is:\n");
for(String s: manyLines) {
System.out.println(s);
}
}
if(!manyLines.isEmpty()) {
for(String s: manyLines) {
String result = s.replaceAll("(?i)\\b([a-z]+)\\b(?:\\s+\\1\\b)+", "$1");
noRepeat.add(result);
}
}
if(!noRepeat.isEmpty()) {
System.out.print("After Remove duplicates:\n");
for(String s: noRepeat) {
System.out.println(s);
}
}
} catch(Exception ex) {
System.out.println(ex);
}
}
}