#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
[[ "\\" =~ ["."] ]] && echo bad 1

[[ "\\" =~ "[.]" ]] && echo bad 2

[[ "\\" =~ [\. ]] && echo bad 3

[[ "\\" =~ [\.] ]] && echo bad 4

[[ "\\" =~ [\\] ]] || echo bad 5

[[ dog =~ [[=d=]].. ]] && echo ok 1
[[ d.. =~ [[=d=]]\.\. ]] && echo ok 2
[[ dog =~ ['[=d=]'].. ]] && echo ok 3	# dubious

[[ dog =~ [[=d=]].[[=G=][=g=]] ]] && echo ok 4
[[ dog =~ [[=d=]].[\[=G=][=g=]] ]] && echo ok 4a

[[ dog =~ "d.." ]] || echo ok 5

[[ dog =~ [[.d.][.D.]]o. ]] && echo ok 6

[[ dog =~ ([[.d.][.D.]])o(.) ]] && echo ok 7 -- ${BASH_REMATCH[1]}
[[ dog =~ d([[.o.][.O.]])(.) ]] && echo ok 8 -- ${BASH_REMATCH[1]}
[[ dog =~ .([[.o.][.O.]])(.) ]] && echo ok 9

[[ dog =~ 'd''o''g' ]] && echo ok 10

[[ ']' =~ [']'] ]] && echo ok 11

[[ a =~ ['a]'] ]] || echo ok 12

[[ "\\" =~ [^]"."] ]] || echo unexpected