正则表达式，获取电子邮件日期头字段的所有部分

Posted 2021-02-26

This snippet is useful if you want to extract the relevant parts out of an Date header field of an email message. It was created according to the [RFC 5322 rules](http://tools.ietf.org/html/rfc5322#page-15 "RFC 5322, Page 15"). It supports named capturing groups for easier access of the date parts.

tested in php 5.2.6

2do:

* deal with obs-% data

'~(s?(?P<weekday>Mon|Tue|Wed|Thu|Fri|Sat|Sun))[,]?s?(?P<day>[0-9]{1,2})s(?P<month>Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)s(?P<year>[0-9]{4})s(?P<hours>[0-9]{2}):(?P<minutes>[0-9]{2})(:(?P<seconds>[0-9]{2}))?s(?P<timezone>[+|-][0-9]{4})s?~'