将证件号码中的英文与中文替换为数字

将证件号码中的英文与中文替换为数字,不足6位用数字补齐.
String str = "王hh3232"  

//替换证件号码中的中文为"00"
                 for(int i=0; i<str.length();i++)  
                 {  
                 System.out.println(str.substring(i,i+1).matches("[\\u4e00-\\u9fa5]+"));  
                 if(str.substring(i,i+1).matches("[\\u4e00-\\u9fa5]+")){
                     str = str.replace(str.substring(i, i+1),"00");
                     System.out.println(str);
                 }
                 }
                
                 //替换证件号码中的英文为"0"
                 for (int i = 0; i < str.length(); i++) {          //遍历输入字符串的每一个字符
                     if (Character.isLetter(str.charAt(i))) {     //判断该字符是否为英文字符
                        str = str.replace(str.substring(i,i+1),"0");  //将字符串中的英文替换为"0"                    
                     }
                 }
                  
                 //长度小于6位用0补齐
                 int length = str.length();
                 int n = 6-length;
                 if(n>0){
                     for(int i=0;i<n;i++){
                         str="0"+str;
                     }
                    
                 }