我怎么做java正则表达式？匹配2-3个字母？

Question

我有我的java项目的问题，我没有添加匹配组合，我有一个字典和混合，字典是有正常的词，在混合从字典一样；在dic。=“鼠标”mixed= "usemo“那些是同一个词，我想做的，如果我写在混合"usmo”程序去字典和4个字母是相同的在字典所以单词是鼠标，或混合= "usem“字典可以改变”鼠标“，我搜索这可以用正则表达式，但我不知道怎么做，有人能帮我吗？？

Answer 1

下面是运行代码，它将与您使用正则表达式搜索的模式进行匹配，并打印字典中的匹配结果。

   public class RegexTestStrings {

    private static HashSet<String> dictionarySet = new HashSet<String>();
    private static HashSet<String> regExSetSet = new HashSet<String>();
    public static void main(String[] args) {
        dictionarySet.add("mouse");
        dictionarySet.add("tiger");
        dictionarySet.add("monkey");
        RegexTestStrings regexTestStrings=new RegexTestStrings();
        System.out.println(regexTestStrings.fidMatchingWord(dictionarySet,"usemo"));
        System.out.println(regexTestStrings.fidMatchingWord(dictionarySet,"usem"));
        System.out.println(regexTestStrings.fidMatchingWord(dictionarySet,"usmo"));
        System.out.println(regexTestStrings.fidMatchingWord(dictionarySet,"kmoy"));
    }

    private String fidMatchingWord(HashSet<String> dictionarySet2, String searchWord) {
        String result=null;
        Iterator<String> dictionarIterator=dictionarySet.iterator();
        while(dictionarIterator.hasNext()){
            regExSetSet.clear();
            String inputString=dictionarIterator.next();
            findAllRegEx(inputString.toCharArray(), 0, inputString.length()-1);
            Iterator<String> resultIterator=regExSetSet.iterator();
            // Regular expression to match the pattern of search string
            String pattern = "(?s)^(" + Pattern.quote(searchWord) + ".*$|.*" + Pattern.quote(searchWord) + ")$";
            while(resultIterator.hasNext()){
                String str=resultIterator.next();
                Pattern p = Pattern.compile(pattern);
                Matcher m = p.matcher(str);
                boolean b = m.matches();
                if(b){
                    result=inputString;
                    break;
                }
            }
        }
        return result;
    }

    public static void findAllRegEx(char[] ary, int startIndex, int endIndex) {
        if(startIndex == endIndex){
            regExSetSet.add(String.valueOf(ary));
        }else{
            for(int i=startIndex;i<=endIndex;i++) {
                 swap(ary, startIndex, i );
                 findAllRegEx(ary, startIndex+1, endIndex);
                 swap(ary, startIndex, i );
            }
        }
    }

    public static void swap(char[] arr, int x, int y) {
        char temp = ary[x];
        arr[x] = arr[y];
        arr[y] = temp;
    }   
}
Output
______________
mouse
mouse
mouse
monkey