A|hello                    |     hello
A|he'll'o                  |     hello
A|he'llo                   |     error
A|he\'llo                  |     he'llo
A|he\\'llo                 |     error
A|abc\tdef                 |     abctdef
A|"abc\tdef"               |     abc\tdef
A|"abc\\tdef"              |     abc\tdef
A|'abc\tdef'               |     abc\tdef
A|hello\                   |     hello
A|hello\\                  |     hello\
A|"hello                   |     error
A|"hello\"                 |     error
A|"hel'lo"                 |     hel'lo
A|'hello                   |     error
A|'hello\'                 |     hello\
A|'hello\there'            |     hello\there
A|'hello\\there'           |     hello\\there
A|"''"                     |     ''
A|$.                       |     $.
A|$1                       |
A|he$1x                    |     hex
A|he$.x                    |     he$.x
# Next one is different on Windows as $pwd==$PWD
U|he$pwd.                  |     he.
W|he$pwd.                  |     he/home.
A|he$PWD                   |     he/home
A|he\$PWD                  |     he$PWD
A|he\\$PWD                 |     he\/home
A|"he\$PWD"                |     he$PWD
A|"he\\$PWD"               |     he\/home
A|he\${}                   |     he${}
A|he\${}xx                 |     he${}xx
A|he${}                    |     he
A|he${}xx                  |     hexx
A|he${hi}                  |     he
A|he${hi}xx                |     hexx
A|he${PWD}                 |     he/home
A|he${.}                   |     error
A|he${XXX:-000}xx          |     he000xx
A|he${PWD:-000}xx          |     he/homexx
A|he${XXX:-$PWD}xx         |     he/homexx
A|he${XXX:-${PWD:-yyy}}xx  |     he/homexx
A|he${XXX:-${YYY:-yyy}}xx  |     heyyyxx
A|he${XXX:YYY}             |     error
A|he${XXX:+${PWD}}xx       |     hexx
A|he${PWD:+${XXX}}xx       |     hexx
A|he${PWD:+${SHELL}}xx     |     hebashxx
A|he${XXX:+000}xx          |     hexx
A|he${PWD:+000}xx          |     he000xx
A|'he${XX}'                |     he${XX}
A|"he${PWD}"               |     he/home
A|"he'$PWD'"               |     he'/home'
A|"$PWD"                   |     /home
A|'$PWD'                   |     $PWD
A|'\$PWD'                  |     \$PWD
A|'"hello"'                |     "hello"
A|he\$PWD                  |     he$PWD
A|"he\$PWD"                |     he$PWD
A|'he\$PWD'                |     he\$PWD
A|he${PWD                  |     error
A|he${PWD:=000}xx          |     error
A|he${PWD:+${PWD}:}xx      |     he/home:xx
A|he${XXX:-\$PWD:}xx       |     he$PWD:xx
A|he${XXX:-\${PWD}z}xx     |     he${PWDz}xx
A|안녕하세요                 |     안녕하세요
A|안'녕'하세요               |     안녕하세요
A|안'녕하세요                |     error
A|안녕\'하세요               |     안녕'하세요
A|안\\'녕하세요              |     error
A|안녕\t하세요               |     안녕t하세요
A|"안녕\t하세요"             |     안녕\t하세요
A|'안녕\t하세요              |     error
A|안녕하세요\                |     안녕하세요
A|안녕하세요\\               |     안녕하세요\
A|"안녕하세요                |     error
A|"안녕하세요\"              |     error
A|"안녕'하세요"              |     안녕'하세요
A|'안녕하세요                |     error
A|'안녕하세요\'              |     안녕하세요\
A|안녕$1x                    |     안녕x
A|안녕$.x                    |     안녕$.x
# Next one is different on Windows as $pwd==$PWD
U|안녕$pwd.                  |     안녕.
W|안녕$pwd.                  |     안녕/home.
A|안녕$PWD                   |     안녕/home
A|안녕\$PWD                  |     안녕$PWD
A|안녕\\$PWD                 |     안녕\/home
A|안녕\${}                   |     안녕${}
A|안녕\${}xx                 |     안녕${}xx
A|안녕${}                    |     안녕
A|안녕${}xx                  |     안녕xx
A|안녕${hi}                  |     안녕
A|안녕${hi}xx                |     안녕xx
A|안녕${PWD}                 |     안녕/home
A|안녕${.}                   |     error
A|안녕${XXX:-000}xx          |     안녕000xx
A|안녕${PWD:-000}xx          |     안녕/homexx
A|안녕${XXX:-$PWD}xx         |     안녕/homexx
A|안녕${XXX:-${PWD:-yyy}}xx  |     안녕/homexx
A|안녕${XXX:-${YYY:-yyy}}xx  |     안녕yyyxx
A|안녕${XXX:YYY}             |     error
A|안녕${XXX:+${PWD}}xx       |     안녕xx
A|안녕${PWD:+${XXX}}xx       |     안녕xx
A|안녕${PWD:+${SHELL}}xx     |     안녕bashxx
A|안녕${XXX:+000}xx          |     안녕xx
A|안녕${PWD:+000}xx          |     안녕000xx
A|'안녕${XX}'                |     안녕${XX}
A|"안녕${PWD}"               |     안녕/home
A|"안녕'$PWD'"               |     안녕'/home'
A|'"안녕"'                   |     "안녕"
A|안녕\$PWD                  |     안녕$PWD
A|"안녕\$PWD"                |     안녕$PWD
A|'안녕\$PWD'                |     안녕\$PWD
A|안녕${PWD                  |     error
A|안녕${PWD:=000}xx          |     error
A|안녕${PWD:+${PWD}:}xx      |     안녕/home:xx
A|안녕${XXX:-\$PWD:}xx       |     안녕$PWD:xx
A|안녕${XXX:-\${PWD}z}xx     |     안녕${PWDz}xx
A|$KOREAN                    |     한국어
A|안녕$KOREAN                |     안녕한국어