feat: SIMPLE_EMAIL_REGEX

src/index.ts

@@ -83,6 +83,7 @@ export * from './semver'
 export * from './web'
 export * from './abort'
 export * from './polyfill'
+export * from './string/regex'
 export * from './zod/zod.util'
 export * from './zod/zod.shared.schemas'
 import { z, ZodSchema, ZodError, ZodIssue } from 'zod'

src/string/regex.test.ts

@@ -0,0 +1,25 @@
+import { zEmail } from '../zod/zod.shared.schemas'
+import { zIsValid } from '../zod/zod.util'
+import { SIMPLE_EMAIL_REGEX } from './regex'
+
+test.each(['[email protected]', '[email protected]', '[email protected]'])(
+  'email valid %',
+  s => {
+    expect(s).toMatch(SIMPLE_EMAIL_REGEX)
+    // cross-check with Zod
+    expect(zIsValid(s, zEmail)).toBe(true)
+  },
+)
+
+test.each([
+  'kirill@@naturalcycles.com',
+  '[email protected]',
+  'kirill@naturalcyclescom',
+  'kirillnaturalcycles.com',
+  '@kirillnaturalcycles.com',
+  '[email protected]@',
+])('email invalid %', s => {
+  expect(s).not.toMatch(SIMPLE_EMAIL_REGEX)
+  // cross-check with Zod
+  expect(zIsValid(s, zEmail)).toBe(false)
+})

src/string/regex.ts

@@ -0,0 +1,6 @@
+/**
+ * Simple, intentionally not exhaustive regex to match an email address.
+ *
+ * Source: https://regexr.com/3e48o
+ */
+export const SIMPLE_EMAIL_REGEX = /^[\w-.]+@([\w-]+\.)+[\w-]{2,4}$/