Make patternSlug customizable

[apiel]

Hello,

Would it be possible to make the patternSlug configurable, so for example if we want to have # in our slug, we could do something like slugify('foo#bar hello$123', {patternSlug: /[^a-zA-Z#\d]+/g}); to get foo#bar-hello-123.

Would be really amazing feature :-)

[sindresorhus]

Why do you need to ignore #? What's the use-case? Then it's technically no longer a slug.

[apiel]

Depends for which purpose we use the slug. We use it in our db to create some tags.

[sindresorhus]

I don't want to expose the pattern slug regex, as it's an implementation detail, and this would lock us into that way of doing it forever. I would be open to an option to preserve a set of given characters, but I think in your case, it would be simpler for you to just split it on #, run the parts through slugify, and then join again.