How to Implement preg_replace_callback Functionality in Java?

Java Counterpart to PHP's preg_replace_callback

In the transition from PHP to Java, developers might encounter discrepancies. One such instance is PHP's preg_replace_callback function, which is missing an exact equivalent in Java. This function allows invoking a callback function for each match found in a regular expression.

To replicate this functionality in Java, a viable approach is to utilize the appendReplacement() and appendTail() methods. Consider the following code snippet:

StringBuffer resultString = new StringBuffer();
Pattern regex = Pattern.compile("regex");
Matcher regexMatcher = regex.matcher(subjectString);
while (regexMatcher.find()) {
  // Different replacement text can be used for each match
  regexMatcher.appendReplacement(resultString, "replacement");
}
regexMatcher.appendTail(resultString);

This approach allows for dynamic replacement text based on each match, akin to PHP's callback feature. By replacing preg_replace_callback with this Java implementation, developers can seamlessly migrate their application with minimal effort.

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