EmerikoandClaude Opus 4.8
88431defba
Swap em dashes for commas/colons/periods in the README, skills, AGENTS.md and its five rule copies, examples, command files, and benchmark README. Rule copies stay in sync (same edit applied to all) and the invariant guard passes. Left untouched on purpose: the vendored caveman SKILL.md (verbatim third-party text), the dated benchmark writeups in results/ (historical records), and .js code comments. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
52 lines
1.3 KiB
Markdown
52 lines
1.3 KiB
Markdown
# Email Validation
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**Task:** "Validate an email address in Python."
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## Without Ponytail
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```python
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import re
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EMAIL_PATTERN = re.compile(
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r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
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)
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class EmailValidator:
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"""Validates email addresses against RFC-like rules."""
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def __init__(self, pattern: re.Pattern = EMAIL_PATTERN):
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self.pattern = pattern
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def validate(self, email: str) -> bool:
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if not isinstance(email, str):
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raise TypeError("email must be a string")
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email = email.strip()
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if not email:
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return False
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return bool(self.pattern.match(email))
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def validate_email(email: str) -> bool:
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"""Convenience wrapper around EmailValidator."""
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return EmailValidator().validate(email)
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```
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A class, a wrapper, a regex that still rejects valid addresses and accepts invalid ones. Regex cannot validate email. Only a delivery attempt can.
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## With Ponytail
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```python
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# ponytail: good enough, real validation is sending the mail
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"@" in email and "." in email.split("@")[-1]
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```
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Or, if it must be thorough, the standard library has it:
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```python
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# ponytail: stdlib covers this
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from email.utils import parseaddr
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"@" in parseaddr(email)[1]
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```
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**27 lines → 1 line.** And the honest answer: let the confirmation email reject it. That's what confirmation emails are for.
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