gistfile1.txt

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PlaceholderReplacer {
    public static void main(String[] args) {
        String input = "abc %current_uk_time% test %another_one%";
        
        // Create a map with placeholder values
        Map<String, String> placeholderValues = new HashMap<>();
        placeholderValues.put("current_uk_time", "10:30 AM");
        placeholderValues.put("another_one", "Hello, World!");

        // Replace placeholders in the input string
        String result = replacePlaceholders(input, placeholderValues);

        System.out.println(result); // Output: abc 10:30 AM test Hello, World!
    }

    public static String replacePlaceholders(String input, Map<String, String> placeholderValues) {
        // Pattern to match placeholders in the format %placeholder_name%
        Pattern pattern = Pattern.compile("%(.*?)%");
        Matcher matcher = pattern.matcher(input);

        StringBuffer result = new StringBuffer();

        while (matcher.find()) {
            String placeholder = matcher.group(1);
            String replacement = placeholderValues.getOrDefault(placeholder, matcher.group(0));
            matcher.appendReplacement(result, replacement);
        }
        matcher.appendTail(result);

        return result.toString();
    }
}