Remove consecutive line breaks and tabs before and after in Java

Postscript I noticed that one character does not match From " ^ [\ t \ n] * ([^ \ t \ n] + (. | \\ s) * [^ \ t \ n] +) [\ t \ n] * $ " Fixed to " ^ [\ t \ n] * ([^ \ t \ n] * (. | \\ s) * [^ \ t \ n] +) [\ t \ n] * $ ". The first plus became an asterisk.

I hate regular expressions. The point is to leave line breaks and tabs other than before and after. I'm really into it, so I'll write an article.

    public static String trimNewline(String str) {
        String regex = "^[\t\n]*([^\t\n]*(.|\\s)*[^\t\n]+)[\t\n]*$";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(str);
        if (m.find()) {
            return m.group(1);
        } else { //"Empty string" and "character string consisting only of tabs and line breaks" do not match and come here
            return "";
        }
    }

Looking at Java regular expressions

• "." Matches any character * All of them are written as, but in fact, ** Any character string other than line breaks ** It was, so I was really into it.

System.out.println(trimNewline("\t\n\t\nhoge\t\n\t\n")); // hoge
System.out.println(trimNewline("\t\n\t\nhoge")); // hoge
System.out.println(trimNewline("hoge\t\n\t\n")); // hoge

Also, there are line breaks and tabs in the middle, "\t\n\n\n\t\tho\t\t\nhoge\nge\t\n\t\n" me too,

It was safely removed only in the front and back.