java regular expression callback ?

Hi,

Goal: prefix each number in a string with 1-5 zeros depending on the number
e.g. if it's less than 10 then prepend 4 zeros, if it's two digits then prefix three zeros.
This basically prefixes each number with zeros so each number is 5 digits.

Source
String str = "1 - test 86";

Desired Result:
String str = "00001 - test 00086";

I've tried this but this adds zeros to every number
str = str .replaceAll("(\\d+)", "00000$1");

any ideas?
svetoslavmAsked:
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for_yanCommented:
             String s900 = "1 - test 86";


   Pattern pp = Pattern.compile("\\d+");



        Matcher m900 = pp.matcher(s900);


        StringBuffer sb = new StringBuffer();
 while (m900.find()) {
     String s701 = s900.substring(m900.start(),m900.end());
     while(s701.length()<5)s701="0"+s701;
     m900.appendReplacement(sb, s701);
 }
 m900.appendTail(sb);
                         System.out.println(sb.toString());

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Output:

00001 - test 00086

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svetoslavmAuthor Commented:
thanks!
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