Using find to locate files that match one of multiple patterns

Use -o, which means "or":

find Documents \( -name "*.py" -o -name "*.html" \)

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You'd need to build that command line programmatically, which isn't that easy.

Are you using bash (or Cygwin on Windows)? If you are, you should be able to do this:

ls **/*.py **/*.html

which might be easier to build programmatically.

Some editions of find, mostly on linux systems, possibly on others aswell support -regex and -regextype options, which finds files with names matching the regex.

for example

find . -regextype posix-egrep -regex ".*\.(py|html)$" 

should do the trick in the above example. However this is not a standard POSIX find function and is implementation dependent.

You could programmatically add more -name clauses, separated by -or:

find Documents \( -name "*.py" -or -name "*.html" \)

Or, go for a simple loop instead:

for F in Documents/*.{py,html}; do ...something with each '$F'... ; done