I just wrote a regex for use with the php function
preg_match that contains the following part:
To match any word character, as well as a minus sign and the dot. While it seems to work in preg_match, I tried to put it into a utility called Reggy and it complaints about "Empty range in char class". Trial and error taught me that this issue was solved by escaping the minus sign, turning the regex into
Since the original appears to work in PHP, I am wondering why I should or should not be escaping the minus sign, and - since the dot is also a character with a meaning in PHP - why I would not need to escape the dot. Is the utility I am using just being silly, is it working with another regex dialect or is my regex really incorrect and am I just lucky that preg_match lets me get away with it?