参考:Pattern
Boundary matchers
^ The beginning of a line
$ The end of a line
\b A word boundary
\B A non-word boundary
\A The beginning of the input
\G The end of the previous match
\Z The end of the input but for the final terminator, if any
\z The end of the input
Scanner中使用读取流的结束
Scanner(istream, charsetName).useDelimiter("\\Z").next();











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