Regex Replace single Char at FileName in a certain string

Question

I have following scenario:

File '/oname=$INSTDIR\workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\SomeModule$SomeModulesData$SomeModulesDataBuilder.class'     '${ADDEDSOURCE}workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\SomeModule$SomeModulesData$SomeModulesDataBuilder.class'    ; Added file
File '/oname=$INSTDIR\workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\CoolUtil.class'  '${ADDEDSOURCE}workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\CoolUtil.class'     ; Added file

I want to replace the '$' Sign in the name of *.class (could be other as well) with '$$'. I am able to get the filename, but just want the one group of Dollar sign.

Here is my example: https://regex101.com/r/Wa2cF6/2

In java I do want to just do :

public static void main(String[] args) {

    String s = "File '/oname=$INSTDIR\\workspace\\jetty\\work\\webapp\\WEB-INF\\classes\\com\\sample\\service\\core\\util\\SomeModule$SomeModulesData$SomeModulesDataBuilder.class' \t'${ADDEDSOURCE}workspace\\jetty\\work\\webapp\\WEB-INF\\classes\\com\\sample\\service\\core\\util\\SomeModule$SomeModulesData$SomeModulesDataBuilder.class' \t; Added file";
    s = s.replace("\\\\([a-zA-Z0-9_$]+)\\.\\w+'\\s", "$$");
    System.out.println(s);
}

And expect a result of

File '/oname=$INSTDIR\workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\SomeModule$$SomeModulesData$$SomeModulesDataBuilder.class'   '${ADDEDSOURCE}workspace\jetty\work\webapp\WEB-INF\classes\com\sample\service\core\util\SomeModule$$SomeModulesData$$SomeModulesDataBuilder.class'  ; Added file

Thanks for your assistance.

Answer 1

So you want to replace the $ sign only in the class name? I would definitely go on a lower level using indexes and the StringBuilder class:

private static final String testString =  "File '/oname=$INSTDIR\\workspace\\jetty\\work\\webapp\\WEB-INF\\classes\\com\\sample\\service\\core\\util\\SomeModule$SomeModulesData$SomeModulesDataBuilder.class' \t'${ADDEDSOURCE}workspace\\jetty\\work\\webapp\\WEB-INF\\classes\\com\\sample\\service\\core\\util\\SomeModule$SomeModulesData$SomeModulesDataBuilder.class' \t; Added file";

public static void main(String[] args) {
    System.out.println(replaceDollars(testString));
}

private static final Pattern PATH = Pattern.compile("(\\'[\\S]*)(\\\\[\\w$]+\\.class\\')");

public static String replaceDollars(String string) {
    Matcher m = PATH.matcher(string);
    StringBuilder builder = new StringBuilder();
    int end = 0;

    while (m.find()) {
        builder
                .append(string, end, m.start())
                .append(m.group(1))
                .append(m.group(2).replace("$", "$$"));
        end = m.end();
    }

    builder.append(string, end, string.length());

    return builder.toString();
}

Using the following regex: (\\'[\\S]*)(\\\\[\\w$]+\\.class\\') to find files in the input string.