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You could opt for using `sed`, which is available by default on most systems and is available even for Windows. The invocation I cooked up should work with non-GNU versions as well. Dissected for the unfamiliar reader's understanding

```sh
# sed -n => no output except what is specifically requested
# Single quotes prevent a lot of messy double escaping with shells that do 
#     interpolation and interpretation of escape sequences with double quotes
# s/.../ => substitute command
# [[:space:]] => the builtin whitespace group
# * => match zero or more times
# name => literal string
# \+ => match one or more times. TOML doesn't mandate spaces around the equals
#     sign, but any formatter and sane person adds them anyway
# = and " => literal symbols
# \(...\) => regex matching group for later use
# [a-zA-Z0-9_] => ASCII letters, numbers, and underscore
# \1 => replace everything matched with just group 1 (the only group here)
# /p => print this output (required because of sed -n)

sed -n 's/[[:space:]]*name[[:space:]]\+=[[:space:]]\+"\([a-zA-Z0-9_]\+\)"/\1/p' pyproject.toml
```
Which prints no more or less than `foo`