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Changes between Version 1 and Version 2 of Ticket #31992, comment 8

v1	v2
5	5	As I can see, nothing was changed with EAI for 6 years from the time this ticket was open and Unicode EAI cannot be used in WP. I would like to propose some things to fix it:
6	6
7		1) Let's modify sanitize_email() and is_email() to use special constants ~~for regex check username and domain name WP_IDN_LOCAL_MAIL_REGEX and WP_IDN_DOMAIN_REGEX in default-constants.php~~ which every admin can change to validate IDN domains rules for language he uses. For example I added Russian IDN rules to these regexes.
	7	1) Let's modify sanitize_email() and is_email() to use special constants in default-constants.php for regex check username and domain name (WP_IDN_LOCAL_MAIL_REGEX and WP_IDN_DOMAIN_REGEX) which every admin can change to validate IDN domains rules for language he uses. For example I added Russian IDN rules to these regexes.
8	8
9	9	2) Let's also add decode_punycode() to sanitize_email() function which check if e-mail domain part in Punycode from and convert it to Unicode as required by uasg.tech