1. run it through spell check, it will find very few proper English words;
2. dot followed by word w/o space, also not proper English punctuation;
3. something(); just cannot be plain English;

First, run it through spell check, it will find very few proper English words, however there should be lot of words that spellchecker will suggest to split.

Then there are punctuation/special characters not typical for plain English, typical for code:

• something(); just cannot be plain English;
• $something where something is not all numeric;
• -> between words w/o spaces;
• . between words w/o space;

Of course to have it working well, you might want to have Bayesian classifier built on top of these characteristics.