Converting JSONP to JSON: Is this Regex correct?

The problem with the code is that it doesn't really express what you are trying to do:

apijson = re.sub(r'([a-zA-Z_0-9\.]*\()|(\);?$)','',jsonp)

The code would seem to indicate that you are trying to find and replace many instances of some regular expressions inside the string. However, you are really trying to strip parts off of the beginning and end. I'm also not a huge fan of regular expressions because they are usually pretty dense and hard to read. Sometimes they are awesome, but this is not one of those times.

Additionally, you aren't anchoring the regular expression to the beginning of the string which is what you'd need to strip off. The only case I could see that being a problem is perhaps if there were strings inside the json which matched the regular expression. Its best to be sure.

Also, I think JSON-P allows functions like alpha["beta"] which will doesn't fit your regular expression. Also what about additional whitespace or comments?

I would suggest doing something like:

   apijson = jsonp[ jsonp.index("(") : jsonp.rindex(")" ]

That way you are more clearly stripping everything outside of the first and last parenthesis.