Function isEmail

isEmail(value: string): boolean
Checks whether a given string is a valid email address.
Parameters
- value: string
  The string to validate as an email address.
Returns boolean
- true if the string is a valid email; otherwise, false.
Remarks
This function uses a practical regular expression to validate email addresses, allowing most common formats while ignoring edge cases defined by full RFC 5322. It requires the presence of an @ symbol and at least one . after it.

Limits enforced:
- Local part (before @): 1–64 characters
- Domain part (after @): 1–255 characters
- Total email length: ≤ 254 characters
Throws
Throws if value is not a string.
Example
```
isEmail('user@example.com'); // true
isEmail('first.last@college.university.in'); // true
isEmail('invalid-email'); // false
isEmail('name@domain'); // false
```
- Defined in src/string/validate.ts:116