If you have them in an array, then all it would seem you would need to do would be:

1. filter out any words that didn't start with a letter (/^\w/)
2. take the above array, then filter for words not ending with a letter (/\w$/)
3. take the resultant array, and filter any words containing characters other than word characters (\w) or hyphen (! /\w(\w\-)+\w$/ maybe)
4. take resulting array, and filter out words containing hyphen 2 or more {2,} times (! /\-{2,}/ maybe).

I would suggest multiple uses of grep as a possibility (but that is just me-I am sure others will come up with better solutions).

I thought up about 6 lines of code to do each step, but thought the code (untested and untried) was not so good, so I removed it from being visible....

Update: Sounds like, if you're using grep or a match, you need to look at anchoring the match you're trying to find if it matches beginning with a hyphen by either doing /^\w/ to match beginning with a word character, or /^\-/ to match against a leading dash.