Why / ^ [a-zA-Z0-9] + @ [a-zA-Z0-9] \. (Com) | (edu) | (org) $ / i does not work properly

Question

I have this regular expression for email authentication (valid only [e-mail] , [e-mail] , [e-mail] )

/^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)|(edu)|(org)$/i

But @ abc.edu and [e-mail] are both valid for the regex above. Can anyone explain why this is?

My approach:

• must have at least one character or number before @

• then comes @

• There must be at least one character or number after @ and earlier.
• the line should end with either edu, com, or org.

Answer 1

/^[a-zA-Z0-9]+@[a-zA-Z0-9]+\.(com|edu|org)$/i

- , "edu" , org. ,

• ^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)
• (edu)
• (org)$

, . ! - . .

Answer 2

:

/^[a-zA-Z0-9]+@[a-zA-Z0-9]+\.(com|edu|org)$/i

, i:

    /^[a-z0-9]+@[a-z0-9]+\.(com|edu|org)$/i

N.B. + , , ...

Answer 3

, , , :

[a-zA-Z0-9] + @[a-zA-Z0-9].com

edu

org

:

/^[a-z0-9]+@[a-z0-9]+\.(com|edu|org)$/i

Answer 4

.

,

, , , Python

import re
pattern = re.compile ('^[a-zA-Z0-9]+@[a-zA-Z0-9]\.(com)|(edu)|(org)$')
re.match('@abc.edu') # fails, use this to validate an input
re.search('@abc.edu') # matches, finds the edu

Answer 5

: [A-Za-Z0-9] + @[A-Za-Z0-9] + ( | Edu | ). + $

U +, (com | edu | org)

: [a-zA-Z0-9] u +