Regular Expressions 101

Community Patterns

RFC 2822 standard email validation with limit of chars in name, domain name,and domain

1

Regular Expression
ECMAScript (JavaScript)

/
(?:[a-z0-9_-]+(?:\.[a-z0-9_-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]| \\[\x01-\x09\x0b\x0c\x0e-\x7f])*"){2,255}@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9]){1,255}?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9]){1,64}?| \[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]: (?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
/