Question $2$

Which strings does the following regular expression match entirely? Circle all that apply.

$([0-9]+1*[1-9]+)|[0-9]+|$

A$."1\mathrm{.}6"$

B$."4\mathrm{.}0"$

C$."12"$

D$."105."$

Question $3$

Which strings does the following regular expression match entirely? Circle all that apply.

:$\text{'}[a-z][-a-z]+$

A$.$ "foo"

B$.$ "foobar"

C$.$ "FooBar"

D$.$ "foo$\_$bar$\_$baz"