Extract bin name from Cargo.toml using Bash - grep

Question

I am trying to extract bin names from from Cargo.toml using Bash, I enabled perl regular expression like this
First attempt
grep -Pzo '(?<=(^\[\[bin\]\]))\s*name\s*=\s*"(.*)"' ./Cargo.toml
The regular expression is tested at regex101
But got nothing
the Pzo options usage can be found here
Second attempt
grep -P (?<=(^[[bin]]))\n*\sname\s=\s*"(.*)" ./Cargo.toml
Still nothing
grep -Pzo '(?<=(^\[\[bin\]\]))\s*name\s*=\s*"(.*)"' ./Cargo.toml
Cargo.toml
[[bin]]
name = "acme1"
path = "bin/acme1.rs"
[[bin]]
name = "acme2"
path = "src/acme1.rs"

Answer 1

grep:
grep -A1 '^\[\[bin\]\]$' |
grep -Po '(?<=^name = ")[^"]*(?=".*)'
or if you can use awk, this is more robust
awk '
$1 ~ /^\[\[?[[:alnum:]]*\]\]?$/{
if ($1=="[[bin]]" || $1=="[bin]") {bin=1}
else {bin=0}
}
bin==1 &&
sub(/^[[:space:]]*name[[:space:]]*=[[:space:]]*/, "") {
sub(/^"/, ""); sub(/".*$/, "")
print
}' cargo.toml
Example:
$ cat cargo.toml
[[bin]]
name = "acme1"
path = "bin/acme1.rs"
[bin]
name="acme2"
[[foo]]
name = "nobin"
[bin]
not_name = "hello"
name="acme3"
path = "src/acme3.rs"
[[bin]]
path = "bin/acme4.rs"
name = "acme4" # a comment
$ sh solution
acme1
acme2
acme3
acme4
Obviously, these are no substitute for a real toml parser.

Answer 2

With your shown samples and attempts, please try following code with tac + awk combination, which will be easier to maintain and does the job with easiness, which will be difficult in grep.
tac Input_file |
awk '
/^name =/{
gsub(/"/,"",$NF)
value=$NF
next
}
/^path[[:space:]]+=[[:space:]]+"bin\//{
print value
value=""
}
' |
tac
Explanation: Adding detailed explanation for above code.
tac Input_file | ##Using tac command on Input_file to print it in bottom to top order.
awk ' ##passing tac output to awk as standard input.
/^name =/{ ##Checking if line starts from name = then do following.
gsub(/"/,"",$NF) ##Globally substituting " with NULL in last field.
value=$NF ##Setting value to last field value here.
next ##next will skip all further statements from here.
}
/^path[[:space:]]+=[[:space:]]+"bin\//{ ##Checking if line starts from path followed by space = followed by spaces followed by "bin/ here.
print value ##printing value here.
value="" ##Nullifying value here.
}
' | ##Passing awk program output as input to tac here.
tac ##Printing values in their actual order.