I'm using a regular expression in python and trying to split a chunk of text by period and by exclamation mark. However when I split it, I get a "None" in the result a = "This is my text...I want it to split by periods. I also want it to split \ by exclamation marks! Is that so much to ask?" This is my code: re.split('((?<=\w)\.(?!\..))|(!)',a) Note that I have this (?<=\w).(?!..) because I want it to avoid ellipses. Nevertheless, the above code spits out: ['This is my text...I want it to split by periods', '.', None, ' \ I also want it to split by exclamation marks', None, '!', \ ' Is that so much to ask?'] As you can see, where a period or exclamation mark is, it has added a special "None" into my list. Why is this and how do I get rid of it? Continue reading...