""
''
"foo"
'foo'
"foo
bar"
'foo
bar'
"$@"
"${foo}"
----------------------------------------------------
[
["string", ["\"\""]],
["string", ["''"]],
["string", ["\"foo\""]],
["string", ["'foo'"]],
["string", ["\"foo\r\nbar\""]],
["string", ["'foo\r\nbar'"]],
["string", [
"\"", ["property", "$@"], "\""
]],
["string", [
"\"", ["property", "${foo}"], "\""
]]
]
----------------------------------------------------
Checks for single-quoted and double-quoted strings.
Also checks for variables in strings.