Regular Expressions Email Pattern Example

{
  "id": "email-validation-basic",
  "name": "Email Address Validation",
  "description": "Validates that a string conforms to the basic structure of an email address with a local part, @ symbol, domain name, and TLD.",
  "pattern": "^[a-zA-Z0-9._%+\\-]+@[a-zA-Z0-9.\\-]+\\.[a-zA-Z]{2,}$",
  "flags": "i",
  "flavor": "PCRE",
  "useCase": "Email Validation",
  "tags": ["Email", "Validation", "Web Forms"],
  "examples": {
    "matching": [
      "user@example.com",
      "firstname.lastname@company.org",
      "user+tag@subdomain.example.co.uk",
      "user123@domain.io"
    ],
    "nonMatching": [
      "not-an-email",
      "@missing-local.com",
      "missing-domain@",
      "missing.dot@comtld",
      "spaces in@email.com"
    ]
  },
  "groups": [],
  "performance": {
    "backtracking": false,
    "catastrophicBacktracking": false,
    "notes": "Simple linear pattern with no catastrophic backtracking risk. Suitable for high-volume validation."
  },
  "created": "2026-05-02",
  "modified": "2026-05-02"
}