import java.util.*;
import java.util.regex.*;
class Ideone
{
{
String s
= "\"Test Line wo line break\"; \"Test Line \nwith line break\"\n\"Test Line2 wo line break\"; \"Test Line2 \nwith line break\""; Matcher m = Pattern.compile("\"[^\"]*\"").matcher(s);
s = m.replaceAll(r -> m.group().replaceAll("\\R+", ""));
}
}
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