用java实现mongodb正则查询

来自：http://blog.sina.com.cn/s/blog_76ccc33d0101en8q.html

//模糊查询
 private BasicDBObject getLikeStr(String findStr){
    Pattern pattern = Pattern.compile("^.*" + findStr + ".*$",Pattern.MULTILINE);
  return newBasicDBObject("$regex", pattern);
 }

  DBObject query = newBasicDBObject();
  query.put("real_name",getLikeStr(userName));

 //endWith文件扩展名
 private BasicDBObject endWithStr(String findStr){
    Pattern pattern = Pattern.compile(findStr + "$",Pattern.MULTILINE);
  return newBasicDBObject("$regex", pattern);
 }

  DBObject query = newBasicDBObject();
  query.put("filename",endWithStr(“.pdf”));

 //startWith文件扩展名
 protected static BasicDBObjectstartWithStr(String findStr) {
    Pattern pattern = Pattern.compile("^" + findStr,Pattern.MULTILINE);
  return newBasicDBObject("$regex", pattern);
 }