Is the nextLine scanner's java function a guarantee of delimiting only newlines?

Question

I looked at the documentation for this feature, and they seemed to say it very vaguely.

Adapts this scanner to the current line and returns the missed input. This method returns the rest of the current line, with the exception of the line separator at the end. The position is set to the beginning of the next line. Since this method continues searching through an input looking for a line separator, it can buffer the entire input line search to skip if there are no line separators.

Under “any line separator,” should this be interpreted as things like NUL, EM, FS, ETX, etc., or just the first newline character that it encounters?

I really want javadocs to be a little more explicit.

Answer 1

The OpenJDK source code shows that it nextLine()uses this regular expression for line breaks:

private static final String LINE_SEPARATOR_PATTERN =
                                       "\r\n|[\n\r\u2028\u2029\u0085]";

• \r\n - end of line of Windows.
• \n - the end of a UNIX line.
• \r - end of Macintosh (pre-OSX).
• \u2028 LINE SEPARATOR .
• \u2029 PARAGRAPH SEPARATOR .
• \u0085 NEXT LINE (NEL) .