javatests/de/jflex/testcase/charclass/char-range-failing.flex (10 lines of code) (raw):
/*
* Copyright 2020, Gerwin Klein <lsf@jflex.de>
* SPDX-License-Identifier: BSD-3-Clause
*/
package de.jflex.testcase.charclass;
%%
BadRange = [b-a]
%%
{BadRange} { }
[^] { }