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[[ "\\" =~ ["."] ]] && 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
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