How not to do validation checking email

Imagine for a moment that you are a newly hired programmer who will have to work with Hot4Learning, the popular learning management system (LMS). Your predecessor once worked on adding the ability to send email to the system - so that any user in school could send an email to another user using the web interface. But, alas, fate was unfavorable to him - he was hit by a bus, and he never completed his magnum opus, his swan song. Your task is to complete his case by adding the validation function of the entered email - so that you can be sure that the letters are sent only if the correct address is attached to the school as the addressee.

Let us give a specific example: let's say Bob is a student at McGill University, and he should be able to send a letter to any valid address @mail.mcgill.ca or @mcgill.ca . If the address of his girlfriend Jane looks like jane.smith@mail.mcgill.ca , then Bob has the full right to send letters to him. In another case, for example, if its address is jane.smith@mail.ru , it is understandable that it does not have the right to do so, as well as sending letters to thisisnotavalidemail@mail.mcgill.ca .

So, your task is to realize this opportunity; it assumes that you have a list of valid email addresses for a particular school.

Most likely, you are now thinking, “Come on, some sort of nonsense, not a task. First, I create a string in which I concatenate all school addresses into a delimited list '| **** |', then I pass it to the client, assigning the string to a variable inside the tag . , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: . . , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

 . ,  JavaScript,       ,   temp .  ,    email,              curForwardUserName ...      validUserName ,      '0' ,      boolean ,     ? ,        temp ;      temp      ,  ,     curForwardUserName -    ,    validUserName   '1'   break . ,  validUserName   '1' ,     ,  curForwardUserName -  ;   ,    " 
 
 "  ?" -   .  ,         . ,      : ", ,        .         ,        O(1),   ,      email".    -      . 
 
        
  Python         : 
 
 if input_email in valid_emails_set: send_email(input_email, another_param, etc) 
 
           
   -        Hot4Learning,  ,  ,     ,        "" ,        .      : 
 : NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning -         Hot4Learning) 
 
 <script> // [-  ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(,     70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [    ] </script> 
 ,     70,000+         .      2.5MB,    . ,    ,   -,      -        . 
 
   
   , IT-     LMS (Blackboard)    (       Hot4Learning,      -         ).       -       ,         .      ,      -     . 
 
    "email"   10       ,     .    - "    ?         , ... . ..." 
     ,       .         ,       . 
 
 , ""         -   -     ,        . ,   -    ,     -  ,         .     ,    -,     @dellsystem . 
 
 :        . 

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

 . ,  JavaScript,       ,   temp .  ,    email,              curForwardUserName ...      validUserName ,      '0' ,      boolean ,     ? ,        temp ;      temp      ,  ,     curForwardUserName -    ,    validUserName   '1'   break . ,  validUserName   '1' ,     ,  curForwardUserName -  ;   ,    " 
 
 "  ?" -   .  ,         . ,      : ", ,        .         ,        O(1),   ,      email".    -      . 
 
        
  Python         : 
 
 if input_email in valid_emails_set: send_email(input_email, another_param, etc) 
 
           
   -        Hot4Learning,  ,  ,     ,        "" ,        .      : 
 : NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning -         Hot4Learning) 
 
 <script> // [-  ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(,     70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [    ] </script> 
 ,     70,000+         .      2.5MB,    . ,    ,   -,      -        . 
 
   
   , IT-     LMS (Blackboard)    (       Hot4Learning,      -         ).       -       ,         .      ,      -     . 
 
    "email"   10       ,     .    - "    ?         , ... . ..." 
     ,       .         ,       . 
 
 , ""         -   -     ,        . ,   -    ,     -  ,         .     ,    -,     @dellsystem . 
 
 :        . 

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .

. , JavaScript, , temp . , email, curForwardUserName ... validUserName , '0' , boolean , ? , temp ; temp , , curForwardUserName - , validUserName '1' break . , validUserName '1' , , curForwardUserName - ; , "

" ?" - . , . , : ", , . , O(1), , email". - .


Python :

if input_email in valid_emails_set: send_email(input_email, another_param, etc)


- Hot4Learning, , , , "" , . :
: NSFWUYWOH (Not Safe For Work Unless You Work On Hot4Learning - Hot4Learning)

<script> // [- ] var userNamesStr = 'a.fakelastname@mail.mcgill.ca|****|another.fakelastname@mail.mcgill.ca |****|(, 70,000 email)|****|zamboni.man@mail.mcgill.ca'; var temp = new Array(); temp = userNamesStr.split('|****|'); var validUserName = '0'; // [ ] for( i =0; i< temp.length; i++){ if( curForwardUserName == temp[i].toLowerCase() ) { validUserName = '1'; break; } // [ ] </script>
, 70,000+ . 2.5MB, . , , -, - .


, IT- LMS (Blackboard) ( Hot4Learning, - ). - , . , - .

"email" 10 , . - " ? , ... . ..."
, . , .

, "" - - , . , - , - , . , -, @dellsystem .

: .