Example of Regular Expression Accumulation

Verify user Email:

Var z =/^ ([a-zA-Z0-9] + [_ | \.]?) * [A-zA-Z0-9] + @ ([a-zA-Z0-9] + [_ | \.]?) * [A-zA-Z0-9] + \. [a-zA-Z] {2, 3} $ /;

If (! Z. test (user_email )){
$ ("# User_email_error" ).html ("incorrect user email format ");
Return false;
}

Verify the IP Address:

Var zz =/^ (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) $ /;

If (! Zz. test (ip )){
Art. dialog. alert ('IP segment is invalid! ', Function (){});
Return false;
}

Verify the ip address segment:

Var zz =/^ (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \. (\ d {1, 2} | 1 \ d | 2 [0-4] \ d | 25 [0-5]) \/([0-9] | 1 [0-9] | 2 [0-9] | 3 [0-2]) $ /;

If (! Zz. test (ip )){
Art. dialog. alert ('IP segment is invalid! ', Function (){});
Return false;
}