Bug not detected RSPEC-5866

[engmscyorku]

Hi Sonarqube Team,

The code below seems to contain the bug described in RSPEC-5866, however, the bug was not being detected during the scan. Any thoughts?

import java.util.regex.Pattern;
class CaseInsensitiveUnicodeBug {
    public boolean showBug(String input, String regex) {
        Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
        return pattern.matcher(input).find();
    }
    public static void main(String[] args) {
        CaseInsensitiveUnicodeBug bug = new CaseInsensitiveUnicodeBug();
        String input = "söme pättern";
        String regex = "SÖME PÄTTERN";
        System.out.println(bug.showBug(input, regex));
    }
}

Sonarqube version 25.5
Lang: Java
SonarScanner version: 5.0.1.3006

Screenshot of code scan results

[Leonardo_Pilastri]

Hello, thanks for the multiple reports.

I have created this ticket to group them up and keep track of them. We will investigate them as soon as we have the capacity for it!

Have a good day