正则表达式 - 文本内不匹配？
我正在使用 iCal 条目：
BEGIN:VEVENT
UID:944f660b-01f8-4e09-95a9-f04a352537d2
ORGANIZER;CN=******
DTSTART;TZID="America/Chicago":20100802T080000
DTEND;TZID="America/Chicago":20100822T170000
STATUS:CONFIRMED
CLASS:PRIVATE
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
TRANSP:OPAQUE
X-MICROSOFT-DISALLOW-COUNTER:TRUE
DTSTAMP:20100802T212130Z
SEQUENCE:0
END:VEVENT
BEGIN:VEVENT
UID:aa132e2b-8a8d-4ffc-9e54-b75249e78c72
RRULE:FREQ=DAILY;COUNT=12;INTERVAL=1
SUMMARY:***********
X-ALT-DESC;FMTTYPE=text/html:<html><body><div style='font-family:Times New R
oman\; font-size: 12pt\; color: #000000\;'></div></body></html>
LOCATION:Map Room
ORGANIZER;CN=*********
DTSTART;TZID="America/Chicago":20100730T080000
DTEND;TZID="America/Chicago":20100730T170000
STATUS:CONFIRMED
CLASS:PUBLIC
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
TRANSP:OPAQUE
X-MICROSOFT-DISALLOW-COUNTER:TRUE
DTSTAMP:20100727T025231Z
SEQUENCE:0
EXDATE;TZID="America/Chicago":20100810T080000
EXDATE;TZID="America/Chicago":20100807T080000
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER;RELATED=START:-PT5M
DESCRIPTION:*********
END:VALARM
END:VEVENT
我需要解析开始和结束时间。我有一个比较函数，可以确定传入的事件是否在两个时间之间。由于计算时间的复杂性增加，我计划不支持重复序列。我想安全起见，并确保我的代码仅将第一个事件读取为匹配项，而不读取第二个事件。因此，我有以下带有单行选项的正则表达式 strong>：
BEGIN:VEVENT.+?
DTSTART;.+?([0-9]{8})T([0-9]{6})
DTEND;.+?([0-9]{8})T([0-9]{6}).+?
END:VEVENT
这让我获得两个条目的开始和结束时间。我的想法是只匹配 BEGIN:VEVENT 和 DTSTART 之间没有 FREQ= 的内容。但是，我不明白该怎么做。我想知道是否有人可以帮助我？
我意识到在某种程度上，一个完整的解析器是一个更好的选择，但我对解析器不熟练，而且我的时间有限。我尝试过使用 !?操作员没有成功。
I am working with iCal entries:
BEGIN:VEVENT
UID:944f660b-01f8-4e09-95a9-f04a352537d2
ORGANIZER;CN=******
DTSTART;TZID="America/Chicago":20100802T080000
DTEND;TZID="America/Chicago":20100822T170000
STATUS:CONFIRMED
CLASS:PRIVATE
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
TRANSP:OPAQUE
X-MICROSOFT-DISALLOW-COUNTER:TRUE
DTSTAMP:20100802T212130Z
SEQUENCE:0
END:VEVENT
BEGIN:VEVENT
UID:aa132e2b-8a8d-4ffc-9e54-b75249e78c72
RRULE:FREQ=DAILY;COUNT=12;INTERVAL=1
SUMMARY:***********
X-ALT-DESC;FMTTYPE=text/html:<html><body><div style='font-family:Times New R
oman\; font-size: 12pt\; color: #000000\;'></div></body></html>
LOCATION:Map Room
ORGANIZER;CN=*********
DTSTART;TZID="America/Chicago":20100730T080000
DTEND;TZID="America/Chicago":20100730T170000
STATUS:CONFIRMED
CLASS:PUBLIC
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
TRANSP:OPAQUE
X-MICROSOFT-DISALLOW-COUNTER:TRUE
DTSTAMP:20100727T025231Z
SEQUENCE:0
EXDATE;TZID="America/Chicago":20100810T080000
EXDATE;TZID="America/Chicago":20100807T080000
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER;RELATED=START:-PT5M
DESCRIPTION:*********
END:VALARM
END:VEVENT
I need to parse out starting and ending times. I have a comparison function that determines if the passed in event is between the two times. Due to the increased complexity in calculating the times I plan on not supporting the recurrance series. I would like to play the safe side and make sure my code only reads the first event as a match and not the second. So I have the following RegEx with the single-line option:
BEGIN:VEVENT.+?
DTSTART;.+?([0-9]{8})T([0-9]{6})
DTEND;.+?([0-9]{8})T([0-9]{6}).+?
END:VEVENT
This gets me the start and end times of both entries. My thought was to only match ones that don't have FREQ= between the BEGIN:VEVENT and DTSTART. I don't understand how to do this, however. I was wondering if someone could help me out here?
I realize at a certain point a full blown parser is a better option, but I am unskilled with parsers and I am under a slight time constraint. I have tried using the !? operator without success.
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评论（2）
编写正则表达式来匹配您不想要的东西比匹配您想要的东西更难。通常当我遇到这种情况时，我发现分两步做事会更容易、更快。在这种情况下，我可能会找到 do 包含
FREQ=的所有事件，删除这些事件，然后继续匹配我想要的开始和结束时间的结果。你能发布你用!?尝试过的正则表达式吗，因为也许它很容易修复...另外，我假设这是在 Objective-C 中，并且我猜测你正在使用的环境确实如此支持!?（但并非全部都支持）...更新
好的，试试这个：
BEGIN:VEVENT.+? (?<!FREQ=.+)DTSTART;.+?([0-9]{8})T([0-9]{6}) DTEND;.+?([0-9]{8})T([0-9]{6}).+? END:VEVENTIt's harder to write a regex to match for things you don't want then to match the things you do want. Usually when I run into this situation, I find it easier and faster to do things in two steps. In this case, I'd probably find all events that do contains
FREQ=, remove those events, then continue matching on the result for the start and end times I want. Could you post the regex you tried with!?, because maybe it's easy to fix... Also, I assume this is in Objective-C, and I'm guessing the environment you're using does support!?(but not all of them do)...UPDATE
Ok, try this one:
BEGIN:VEVENT.+? (?<!FREQ=.+)DTSTART;.+?([0-9]{8})T([0-9]{6}) DTEND;.+?([0-9]{8})T([0-9]{6}).+? END:VEVENT为什么不使用 PHP iCalendar 解析器？
http://www.phpclasses.org/browse/file/16660.html
Why not use a PHP iCalendar parser?
http://www.phpclasses.org/browse/file/16660.html