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Regex not proceeded or followed by a -


newbtophp
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~^(??<!\-)[a-z0-9\-]{2,}(?!\-)|(?<!\-)[a-z0-9\-]+(?!\-)\.(?<!\-)[a-z0-9\-]{2,}(?!\-))$~D

 

I have the above expression, which will match the specified characters (with the specified length) and optionally a fullstop followed by more specified characters (with the specified length).

 

Im trying to make it so it matches only if its not proceeded by a - and not followed by a - .

 

So example the following will match:

 

hey.phpfreaks

hey

yo-u.me

 

However the following will not match:

-hey

hey-

-hey-

you.-he

 

I've tried using (?<!\-) (not proceeded by -) and (?!\-) (not followed by -) but that doesn't seem to work?  :wtf:

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