gistfile1.txt

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PlaceholderExtractor {
    public static void main(String[] args) {
        String input = "abc %current_uk_time% test %another_one%";
        
        // Extract placeholders from the input string
        Set<String> placeholders = extractPlaceholders(input);
        
        // Print extracted placeholders
        System.out.println(placeholders); // Output: [current_uk_time, another_one]
    }

    public static Set<String> extractPlaceholders(String input) {
        Set<String> placeholders = new HashSet<>();
        
        // Pattern to match placeholders in the format %placeholder_name%
        Pattern pattern = Pattern.compile("%(.*?)%");
        Matcher matcher = pattern.matcher(input);

        while (matcher.find()) {
            // Extract the placeholder name (without the % characters)
            String placeholder = matcher.group(1);
            placeholders.add(placeholder);
        }

        return placeholders;
    }
}