问题描述
我的问题是我想使用纯正则表达式检查浏览器字符串。
My problem is that i want to check the browserstring with pure regex.
Mozilla/5.0 (Linux; U; Android 3.0; en-us; Xoom Build/HRI39) AppleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Safari/534.13
->应该匹配
Mozilla/5.0 (Linux; U; Android 2.2.1; en-us; Nexus One Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
不匹配
我尝试过的解决方案是: /?((?< = Android)(?:[^])*?( ?= Mobile))/ i
,但匹配完全错误。
my tried solution is: /?((?<=Android)(?:[^])*?(?=Mobile))/i
but it matches exactly wrong.
推荐答案
您使用前瞻性断言来检查字符串中是否包含单词。
You use look ahead assertions to check if a string contains a word or not.
如果您要确保字符串在某个位置包含 Android,则可以这样做
If you want to assure that the string contains "Android" at some place you can do it like this:
^(?=.*Android).*
您也可以将它们合并,以确保其中包含 Android某个地方,然后在某个地方移动:
You can also combine them, to ensure that it contains "Android" at some place AND "Mobile" at some place:
^(?=.*Android)(?=.*Mobile).*
如果要确保某个单词不在字符串中,请使用负号:
If you want to ensure that a certain word is NOT in the string, use the negative look ahead:
^(?=.*Android)(?!.*Mobile).*
这将要求单词 Android包含在字符串中,而单词 Mobile不允许包含在字符串中。 。*
部分匹配,当开头的断言为真时,则匹配完整的字符串/行。
This would require the word "Android to be in the string and the word "Mobile" is not allowed in the string. The .*
part matches then the complete string/row when the assertions at the beginning are true.
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