Hey, I'm no master by any means!
I have, however, played around with them quite a lot.
AS for the list of characters you listed, I actually explained in below the code snippet.
This entire chunk (which includes part of your question:
[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]
Checks that the start of the string has valid characters, meaning, characters that a username inside an email address can have (as Wikipedia mentions here: en.wikipedia.org/wiki/Email_addres...).
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Hey, I'm no master by any means!
I have, however, played around with them quite a lot.
AS for the list of characters you listed, I actually explained in below the code snippet.
This entire chunk (which includes part of your question:
Checks that the start of the string has valid characters, meaning, characters that a username inside an email address can have (as Wikipedia mentions here: en.wikipedia.org/wiki/Email_addres...).