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Editorial Team
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Asked: 2026-06-11T14:10:07+00:00

public static void main(String[] args) { Pattern p = Pattern.compile([A-Z]*); Matcher matcher = p.matcher(CSE);

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public static void main(String[] args) {
    Pattern p = Pattern.compile("[A-Z]*");
    Matcher matcher = p.matcher("CSE");
    System.out.println(matcher.group());
}

why is the obove code raising an java.lang.IllegalStateException ? How can i match any number of capital letters?

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1 Answer

  1. Editorial Team

    You need to call Matcher.find() to initiate the regex matching process.

    public static void main(String[] args)
{
    Pattern p = Pattern.compile("[A-Z]*");
    Matcher matcher = p.matcher("CSE");
    while (matcher.find()) {
        System.out.println(matcher.group());
    }
}
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