I need a python3 regex that would give true if it matches "test" in the following scenarios (white space before the slashes (if any) should be okay to match):

test.anyextension

/test

\test

\test.foward_or_back_slash_plusextension_is_okay

\test

test

test.whitespace_plus_someextension

you get the idea...

but avoid matching:

jtest.a

/sometest

something_before_the_slash_other_thanwhitespace\test.exentsion

Explanations would be great, Thank you!