feat(regex): add cidr regex (#982)

Author: Tom Lienard

packages/regex/src/index.ts

@@ -54,6 +54,13 @@ const v6 = `
   .replace(/\n/g, '')
   .trim()
 
+// Pasted from `cidr-regex` package (https://github.com/silverwind/cidr-regex/blob/master/index.js)
+const cidrv4 = `${v4}\\/(3[0-2]|[12]?[0-9])`
+const cidrv6 = `${v6}\\/(12[0-8]|1[01][0-9]|[1-9]?[0-9])`
+
 export const ip = new RegExp(`^(?:${v4}|${v6})$`)
 export const ipv4 = new RegExp(`^${v4}$`)
 export const ipv6 = new RegExp(`^${v6}$`)
+export const ipCidr = new RegExp(`(?:^${cidrv4}$)|(?:^${cidrv6}$)`)
+export const ipv4Cidr = new RegExp(`^${cidrv4}$`)
+export const ipv6Cidr = new RegExp(`^${cidrv6}$`)