How to replace a set of tokens in a Java String?

Question

I have a template string for which I need to add variables in it. Below is the string:

"Hello [Name] Please find attached [Invoice Number] which is due on [Due Date]".

Can anyone help me how I can able to replace the tokens to variables?

Answer 1

You can try the below code, which will help you to replace:

public static String replaceTokens(String text, 

                                   Map<String, String> replacements) {

    Pattern pattern = Pattern.compile("\\[(.+?)\\]");

    Matcher matcher = pattern.matcher(text);

    StringBuffer buffer = new StringBuffer();

    while (matcher.find()) {

        String replacement = replacements.get(matcher.group(1));

        if (replacement != null) {

            // matcher.appendReplacement(buffer, replacement);

            // see comment 

            matcher.appendReplacement(buffer, "");

            buffer.append(replacement);

        }

    }

    matcher.appendTail(buffer);

    return buffer.toString();

}

I hope this will help.

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