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151 lines
3.1 KiB
Markdown
151 lines
3.1 KiB
Markdown
---
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id: 68cae5b538ff798bbd4da005
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title: "Challenge 67: Email Validator"
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challengeType: 29
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dashedName: challenge-67
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---
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# --description--
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Given a string, determine if it is a valid email address using the following constraints:
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- It must contain exactly one `@` symbol.
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- The local part (before the `@`):
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- Can only contain letters (`a-z`, `A-Z`), digits (`0-9`), dots (`.`), underscores (`_`), or hyphens (`-`).
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- Cannot start or end with a dot.
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- The domain part (after the `@`):
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- Must contain at least one dot.
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- Must end with a dot followed by at least two letters.
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- Neither the local or domain part can have two dots in a row.
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# --hints--
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`validate("a@b.cd")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("a@b.cd"), True)`)
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}})
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```
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`validate("hell.-w.rld@example.com")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("hell.-w.rld@example.com"), True)`)
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}})
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```
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`validate(".b@sh.rc")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate(".b@sh.rc"), False)`)
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}})
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```
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`validate("example@test.c0")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("example@test.c0"), False)`)
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}})
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```
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`validate("freecodecamp.org")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("freecodecamp.org"), False)`)
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}})
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```
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`validate("develop.ment_user@c0D!NG.R.CKS")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("develop.ment_user@c0D!NG.R.CKS"), True)`)
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}})
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```
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`validate("hello.@wo.rld")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("hello.@wo.rld"), False)`)
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}})
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```
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`validate("hello@world..com")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("hello@world..com"), False)`)
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}})
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```
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`validate("develop..ment_user@c0D!NG.R.CKS")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("develop..ment_user@c0D!NG.R.CKS"), False)`)
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}})
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```
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`validate("git@commit@push.io")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(validate("git@commit@push.io"), False)`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def validate(email):
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return email
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```
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# --solutions--
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```py
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import re
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def validate(email):
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if '..' in email:
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return False
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parts = email.split('@')
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if len(parts) != 2:
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return False
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local, domain = parts
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if local.startswith('.') or local.endswith('.'):
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return False
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if not re.match(r'^[a-zA-Z0-9._-]+$', local):
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return False
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if '.' not in domain:
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return False
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tld = domain.split('.')[-1]
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if len(tld) < 2 or not tld.isalpha():
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return False
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return True
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```
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