Is There a Java Equivalent to PHP's preg_replace_callback()?

Java Equivalent to PHP's preg_replace_callback

The PHP function preg_replace_callback() invokes a callback function for each match found in a regular expression. Does Java offer an equivalent functionality?

Java's Alternative: Embracing the Native Approach

While Java doesn't provide a direct equivalent to preg_replace_callback(), it does empower us with an alternative approach leveraging Matcher and StringBuffer. Here's how you can achieve similar results:

Step 1: Compile the Regular Expression

Matcher regexMatcher = regex.matcher(subjectString);

Step 2: Iterate over Matches

while (regexMatcher.find())

Step 3: Modify Replacement Text Dynamically

regexMatcher.appendReplacement(resultString, "replacement");

Step 4: Append Context Tail

regexMatcher.appendTail(resultString);

Example:

StringBuffer resultString = new StringBuffer();
Pattern regex = Pattern.compile("\[thumb(\d+)\]");
Matcher regexMatcher = regex.matcher(subjectString);
while (regexMatcher.find()) {
  regexMatcher.appendReplacement(resultString, "<img src=\"thumbs/" + photos[regexMatcher.group(1)] + "\">");
}
regexMatcher.appendTail(resultString);

By following these steps, you can repurpose your PHP code seamlessly in Java and gracefully handle regular expression matches with custom replacements.

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