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Simple Email Validation, Case Insensitive, w/ Restrictions on Characters - Regex

^[A-Z0-9+_.-]+@[A-Z0-9.-]+$

Simple Email Validation, Case Insensitive, w/ Restrictions on Characters, 2nd Example - Regex

A[A-Z0-9+_.-]+@[A-Z0-9.-]+

Simple Email Validation, Case Insensitive, w/ All Valid Local Part Characters (whatever tf that means to you...) - Regex

^[A-Z0-9_!#$%&'*+/=?`{|}~^.-]+@[A-Z0-9.-]+$

Simple Email Validation, Case Insensitive, w/ All Valid Local Part Characters (whatever tf that means to you...), 2nd Example - Regex

A[A-Z0-9_!#$%&'*+/=?`{|}~^.-]+@[A-Z0-9.-]+