| hello | hello |
| he'll'o | hello |
| he'llo | hello |
| he\'llo | he'llo |
| he\\'llo | he\llo |
| abc\tdef | abctdef |
| "abc\tdef" | abc\tdef |
| 'abc\tdef' | abc\tdef |
| hello\ | hello |
| hello\\ | hello\ |
| "hello | hello |
| "hello\" | hello" |
| "hel'lo" | hel'lo |
| 'hello | hello |
| 'hello\' | hello\ |
| "''" | '' |
| $. | $. |
| $1 | |
| he$1x | hex |
| he$.x | he$.x |
| he$pwd. | he. |
| he$PWD | he/home |
| he\$PWD | he$PWD |
| he\\$PWD | he\/home |
| he\${} | he${} |
| he\${}xx | he${}xx |
| he${} | he |
| he${}xx | hexx |
| he${hi} | he |
| he${hi}xx | hexx |
| he${PWD} | he/home |
| he${.} | error |
| he${XXX:-000}xx | he000xx |
| he${PWD:-000}xx | he/homexx |
| he${XXX:-$PWD}xx | he/homexx |
| he${XXX:-${PWD:-yyy}}xx | he/homexx |
| he${XXX:-${YYY:-yyy}}xx | heyyyxx |
| he${XXX:YYY} | error |
| he${XXX:+${PWD}}xx | hexx |
| he${PWD:+${XXX}}xx | hexx |
| he${PWD:+${SHELL}}xx | hebashxx |
| he${XXX:+000}xx | hexx |
| he${PWD:+000}xx | he000xx |
| 'he${XX}' | he${XX} |
| "he${PWD}" | he/home |
| "he'$PWD'" | he'/home' |
| "$PWD" | /home |
| '$PWD' | $PWD |
| '\$PWD' | \$PWD |
| '"hello"' | "hello" |
| he\$PWD | he$PWD |
| "he\$PWD" | he$PWD |
| 'he\$PWD' | he\$PWD |
| he${PWD | error |
| he${PWD:=000}xx | error |
| he${PWD:+${PWD}:}xx | he/home:xx |
| he${XXX:-\$PWD:}xx | he$PWD:xx |
| he${XXX:-\${PWD}z}xx | he${PWDz}xx |
