Java equivalent to PHP’s preg_replace_callback

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Trying to emulate PHP’s callback feature seems an awful lot of work when you could just use appendReplacement() and appendTail() in a loop:

StringBuffer resultString = new StringBuffer();
Pattern regex = Pattern.compile("regex");
Matcher regexMatcher = regex.matcher(subjectString);
while (regexMatcher.find()) {
  // You can vary the replacement text for each match on-the-fly
  regexMatcher.appendReplacement(resultString, "replacement");
}
regexMatcher.appendTail(resultString);

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