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FULL PRODUCT VERSION :

A DESCRIPTION OF THE PROBLEM :
The serialization and deserialization of a pattern that contains a (?idmsuxU-idmsuxU) - construct does not work.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :

1. Compile the pattern "a(?-i)b" with Pattern.CASE_INSENSITIVE
2. Serialize and deserialize it using ObjectOutput- and ObjectInputStream
3. The pattern should match against the input "Ab" but does not

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The pattern should match against the input "Ab"
ACTUAL -
The pattern didn't match against the input "Ab"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.regex.*;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class RegexBug4 {

public static void main(String [] args) {
Pattern p = Pattern.compile("a(?-i)b", Pattern.CASE_INSENSITIVE );
System.out.println(p.matcher("Ab").matches() );
System.out.println(p.matcher("AB").matches() );
p = serializeAndDeserialize(p);
System.out.println(p.matcher("Ab").matches() );
System.out.println(p.matcher("AB").matches() );
}

private static Pattern serializeAndDeserialize(Pattern pattern){
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(pattern);
oos.close();
ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
Pattern serializedPattern = (Pattern) ois.readObject();
ois.close();

return serializedPattern;
} catch( IOException | ClassNotFoundException ioe) {
ioe.printStackTrace();
return null;
}
}
}
---------- END SOURCE ----------