Mismatch of word count in JS and PHP

One example is content has a standalone hyphen. Counted as a separate word in PHP but probably not in JS.

Another example is when the following MathJax expression is used: `Porter also defined the generic structure of a word as \([C] (VC)^{m} [V]\), where [ ] denotes arbitrary presence, C is one or more consonants, V is one or more vowels and m is the word's **measure**.`