Add `.numeric()` to `ZodString`

[icecreamparlor]

Hi 👋

I think it would be great to add numericString in ZodString. It is just util for regex checker, but I belive it would be useful in many cases.

Related Issue : https://github.com/colinhacks/zod/issues/1240

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[igalklebanov]

Numeric seems redundant given its called in z.string() context. Why not simply z.string().numeric()?

[icecreamparlor]

Numeric seems redundant given its called in z.string() context. Why not simply z.string().numeric()?

I think numeric seems better. I renamed numericString to numeric

[icecreamparlor]

(cc. @colinhacks)

[einarpersson]

Great, was just looking for this! Hope it gets merged soon!

[icecreamparlor]

Any updates ..? I think this PR can help many people : )

[jacksonblankenship]

I could really use this for one of my current projects 👀

[softcam-claiton]

Hello, any updates on when this will be merged?

[colinhacks]

Thanks for the excellent PR here, and apologies for taking so long to address it. At the moment, I'm trying to keep Zod's core feature set as small as possible; since this is achievable with .regex() or .refine() I'm inclined to keep it separate.

Zod 4 will expose a bunch of utility regexes, and I'll be sure this one is included.