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Email validation has issues: no + or - no domains longer than 3 chars #13

Description

@MischaKr

File:
Form.php

Current:
'email' => '/^\w+([.-]?\w+)@\w+([.-]?\w+)(.\w{2,3})+$/',

AI analysis:

Key points:

  • ^\w+ → Local part must start with one or more “word” characters (letters, digits, underscore only — no plus sign allowed here).
  • ([.-]?\w+)* → Allows optional dot or hyphen, followed by word characters, repeated any number of times.
  • Domain part (@\w+([.-]?\w+)*) → Same dot/hyphen rules as local part.
  • (.\w{2,3})+ → Top‑level domain must be 2 or 3 “word” chars only (e.g., .com, .nz) — cannot match .info or longer TLDs.

So loads of things that are not ideal with this regex.

Proposed:

'email' => '/^(?!.)(?!.*..)[A-Za-z0-9._%+-]+(?<!.)@(?:(?!-)[A-Za-z0-9-]{1,63}(?<!-).)+[A-Za-z]{2,}$/',

Simple test:

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