Unable to turn off spelling for words followed by punctuation characters

I'm have a tough time turning off spell checking for words that immediately follow a punctuation character.

For example, I don't want any of the words in this path to be spellchecked:

/kjkj/kasjdf/kjdsf

So I did:

syn match UrlNoSpell '[\/]w\+' contains=@NoSpell

This works.

However, this doesn't:

syn match UrlNoSpell '[:punct:]w\+' contains=@NoSpell

Even this doesn't work:

"syn match UrlNoSpell '[\/\.]w\+' contains=@NoSpell

Any words preceded with a period are still spell checked. I tried with both magic and no magic. Nothing works.

I obviously don't know how character classes work in vim. Didn't find anything in :h regex that gave me any hints as to what the problem might be. Can someone clue me in?

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