The "\1" and "\2" are for replacement groups in the regex. These are defined by parentheses around sections of the pattern. You search should be:
Code:
([a-z,A-Z])-([a-z,A-Z])
But, I don't think you want the commas. With them, it will match a comma before or after a hyphen. It probably won't matter as I wouldn't expect to find that. But, it probably should be:
Code:
([a-zA-Z])-([a-zA-Z])