[ ] Open
[x] Checked
[@] Ongoing
[~] Obsolete

[*] Invalid
[o] Invalid
[X] Invalid (uppercase)
[ ] Invalid (non-breaking space)

[] Invalid
[  ] Invalid
[ x ] Invalid
[@@] Invalid

 [x] Invalid
    [x] Invalid

[ ] Do this

[ ]   Do this

[ ]
[ ]
[ ]

[ ]Invalid
[ ]! Invalid
[ ]. Invalid
[ ]!!. Invalid
[ ]#invalid
[ ]->2022-02-16 Invalid

[ ] This is a longer ...
    description text
[ ] And this one ...
    is even ...
    longer

[ ] The following is just ...
    [ ] description text

[x] These lines ...
    should all ...
    look the same

[ ] This has some ...
       more spaces
[ ] And this one ...
             as well

[ ] The next line is ...
invalid
[ ] The next line is ...
 invalid
[ ] The next line is ...
   invalid
[ ] The next line is ...
	invalid (it’s a tab)

[ ] ! This is important
[ ] !!! This is very important
[ ] !!!!!!!!!! This super important

[ ] ..! This is important
[ ] !!. This is more important
[ ] ... This is not important

[ ] !   Do something
[ ] .   Do something

[ ]    ! Do something
[ ]    . Do something

[ ] .!. Invalid
[ ] !.! Invalid

[ ] !This has regular priority
[ ] .The dot is not priority
[ ] This is also
    !!! not important

[ ] ! !!! This is important!
[ ] !! ! ! This ! is also important
[ ] !. ... This . is also important
[ ] . ! This is not important

[ ] -> 2022-01-31
[ ] Do this -> 2022-01-31
[ ] -> 2022-01-31 (something)
[ ] Do something until ...
    -> 2022-01-31

[ ] -> 2022-01-31
[ ] -> 2022-01
[ ] -> 2022
[ ] -> 2022-W01
[ ] -> 2022-Q1

[ ] -> 2022/01/31
[ ] -> 2022/W01

[ ] -> 2022-01/31

[ ] -> 2022-01-31 -> 2022-01-31

[ ] Do this soon -> 2022-01-31!!!
[ ] Do this (-> 2022-01-31)

[ ] ---> 2022-01-31
[ ] Due-> 2022-01-31
[ ] -> 2022-01-31very urgent
[ ] -> 2022-01-31T10:00
[ ] -> 2022-01-31-0
[ ] -> 2022/01/31/0

[ ] ->2022-01-31
[ ] → 2022-01-31
[ ] ->   2022-01-31
[ ] >2022-01-31
[ ] Do until ->
    2022-01-31

[ ] #tag
[ ] #T-A-G
[ ] #--tag--
[ ] #__tag__
[ ] #t_a_g
[ ] #123
[ ] #___
[ ] #---
[ ] #1t2a3g
[ ] #täg
[ ] #今日は
[ ] #გამარჯობა

[ ] This #text contains #tags
[ ] #Actually, it #has a #LOT.
    Even on the #next-line!

[ ] This is a #tag.
[ ] Tags: #tag1/#tag2
[ ] #t-a-g!
[ ] #--tag--?
[ ] #--tag--:text
[ ] (#tag)
[ ] #tag🥳

[ ] Not a tag: #

[ ] #tag=value
[ ] #t-a-g=v-a-l-u-e
[ ] #国=日本

[ ] #tag=
[ ] #tag=""
[ ] #tag=''

[ ] #tag="v a l u e"
[ ] #tag='v!a.l?u+e'
[ ] #tag='foo'bar
[ ] #tag='foo'-bar
[ ] #tag='foo'!!
[ ] (#tag="bar")

[ ] #tag='It\'s great

[ ] #tag="v a l u e
[ ] #tag="v a l u e'
[ ] #tag="hello
    World!"

[ ] Item 1 of group
[ ] Item 2 of group

[ ] Item of another group

Todos
[ ] Item 1
[ ] Item 2

Group 1
[ ] Item

Group 2
[ ] Item

Todos

 Todos
[ ] Do this

    Todos
[ ] Do this

[Todos]
[ ] Do this

[ ] Do this
Todos
[ ] Do this