I came across several questions but without an answer for my problem.

I have a code camming from data-base in this format: FR000009.

The output should be: FR000010

String original = "FR000009";
    String incremented = "FR"    String.format("%0"   (original.length() - 2)   "d",
            Integer.parseInt(original.substring(2))   1);
    System.out.println(incremented);

Here came the difference from other questions: I want to parse the string without the need of hardcoding FR like in the example above. In time there can be different country codes (DE, UK,RO etc).

CodePudding user response：

You can use this code by stripping all digits first and then stripping all non-digits:

String original = "FR000009";

String repl = String.format("%s%0"   (original.length() - 2)   "d",
    original.replaceFirst("\\d ", ""),
   (Integer.valueOf(original.replaceFirst("\\D ", ""))   1));
//=> "FR000010"

Here:

• replaceFirst("\\d ", ""): removes all digits from input, giving us FR
• replaceFirst("\\D ", ""): removes all non-digits from input, giving us 000009

Note that if there are always only 2 letters at the start and remaining are digits then you won't even need a regex code, just use substring:

String repl = String.format("%s%0"   (original.length() - 2)   "d",
   original.substring(0, 2),
   (Integer.valueOf(original.substring(2))   1));

CodePudding user response：

Why not just split between digits and leters:

String input = "FR100109";
String[] splited = input.split("(?<=\\D)(?=\\d)");
int incremented = Integer.parseInt(splited[1])   1;
String formated = String.format("%0"  splited[1].length()   "d", incremented);
System.out.println(splited[0]   formated);

CodePudding user response：

You need a method where you can pass in the country code and create a new string from the old one.

Your requirement isn't clear. I can't tell if you always want to increment the value, regardless of country code.

I think you need a better abstraction than a String. I don't know what this String is, but I'd recommend a class with a static counter and a method that takes in a country code and returns a String value after incrementing the counter. No parsing needed.