JFlex 1.6.1 发布，次版本主要有以下更新：
- Fixed issue #130, “in caseless mode, chars in regexps not accepted caselessly”: Caseless option works again as intended.
- Fixed issue #131, “re-enable scanning interactively or from a network byte stream”: JFlex now throws an IOException when a Reader returns 0 characters.
- New example, shows how to deal with Readers that return 0 characters.
- Command line scripts work again in repository version (contributed by Emma Strubell)
- New options –warn-unused and –no-warn-unused that control warnings about unused macros.
- Fixed issue #125: %apiprivate and %cup2 switches now no longer incompatible
- Fix issue #133, “Error in skeleton.nested”: Empty-string matches were taking precedence over EOF and caused non-termination. Now EOF is counted as the highest-priority empty match.
- New warning when an expression matches the empty string (can lead to non-termination).
JFlex 是一个 Java 的词法/语法分析生成器。