How search for files using regex in linux shell script

Find all .py files.

find / -name '*.py'

Find files with the word "python" in the name.

find / -name '*python*'

Same as above but case-insensitive.

find / -iname '*python*'

Regex match, more flexible. Find both .py files and files with the word "python" in the name.

find / -regex '.*python.*\|.*\.py'