NSRegularExpressionOptions?

[sharplet]

I'm personally fairly happy with the defaults, but if there's enough demand for some options it would be good to look into.

Case (in)sensitivity is one consideration.

[leotumwattana]

+1 for case (in)sensitivity

[sharplet]

Awesome. Are you interested in submitting a PR?

I've been thinking a little about the API—here's what I've come up with, for posterity.

I think this kind of thing is probably the most obvious:

Regex("foo", caseSensitive: false)
Regex("foo", ignoreCase: true)
Regex("foo", options: [.IgnoreCase])

It has the downside of being a little wordy though.

I'm not entirely opposed to using PCRE style options, specified as a second string:

Regex("foo", "i") // => /foo/i

It's not as user-friendly, but it's pretty standard these days, and I think the added brevity could be really nice.

[gfontenot]

I vote for Regex("foo", options: [.IgnoreCase]). Seems like it's a nice compromise between verbosity, flexibility, and ease of use.

[mokagio]

I'm on the Regex("pizza", options: [.IgnoreCase]) wagon too, in particular for the flexibility.