[英]java, regex string not containing a set of word between /
I know this seems a common question, but can't get rid of my problem dispite searching. 我知道这似乎是一个常见的问题,但是尽管搜索也无法摆脱我的问题。 I need a regex that matchs only string that doesn't start with a specified set of words and surrounded by /.
我需要一个仅与不以指定的单词集开头且由/包围的字符串匹配的正则表达式。 Example:
例:
/harry/white
/sebastian/red
/tom/black
/tomas/green
I don't want strings starting with /harry/ and /tom/, so I expect 我不希望以/ harry /和/ tom /开头的字符串,所以我希望
/harry/white NO
/sebastian/red YES
/tom/black NO
/tomas/green YES
1) ^/(?!(harry|tom)).* doesn't match /tomas/green
2) ^/(?!(harry|tom))/.* matchs nothing
3) ^/((harry|tom))/.* matchs the opposite
What is the right regex? 什么是正确的正则表达式? I'd appreciate much if someone explain me why 1 and 2 are wrong.
如果有人向我解释为什么1和2错误,我将不胜感激。 Please don't blame me :) Thanks.
请不要怪我:)谢谢。
You need to add the ending slash for both of them inside the negative look-ahead, not outside: 您需要在负前瞻而不是外部添加两个结尾的斜杠 :
^/(?!(harry|tom)/).*
Not adding a slash, will match tom
in tomas
, and the negative look-ahead will not satisfy. 不添加斜杠,将匹配
tom
中的tom
,并且负tomas
将无法满足。
Try: 尝试:
^(?!/(harry|tom)/).*
Why number 1 is wrong: the lookahead should make sure that harry
or tom
are followed by a slash. 为什么数字1是错误的:前行应确保在
harry
或tom
后面加上斜杠。
Why number 2 is wrong: ignore the lookahead; 为什么数字2是错误的:忽略前瞻; note that the pattern is trying to match two slashes at the start of the string.
请注意,该模式试图在字符串的开头匹配两个斜杠。
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