英文:
Regex newline and whitespace in golang
问题
我正在尝试使用正则表达式匹配以下字符串,并从中获取一些值。
/system1/sensor37
Targets
Properties
DeviceID=37-Fuse
ElementName=Power Supply
OperationalStatus=Ok
RateUnits=Celsius
CurrentReading=49
SensorType=Temperature
HealthState=Ok
oemhp_CautionValue=100
oemhp_CriticalValue=Not Applicable
我使用了以下正则表达式:
`/system1/sensor\d\d\n.*\n.*\n\s*DeviceID=(?P<sensor>.*)\n.*\n.*\n.*\n\s*CurrentReading=(?P<reading>\d*)\n\s*SensorType=Temperature\n\s*HealthState=(?P<health>.*)\n`
现在我的问题是:有没有更好的方法来做到这一点?
我在字符串中明确提到了每个换行符和空格组。但是我可以只写/system.sensor\d\d.*DeviceID=(?P<sensor>.*)\n*.
(对我来说没有起作用,但我相信应该有一种方法可以实现。)
英文:
I was trying to match the below string with a regex and get some values out of it.
/system1/sensor37
Targets
Properties
DeviceID=37-Fuse
ElementName=Power Supply
OperationalStatus=Ok
RateUnits=Celsius
CurrentReading=49
SensorType=Temperature
HealthState=Ok
oemhp_CautionValue=100
oemhp_CriticalValue=Not Applicable
Used the below regex for that
`/system1/sensor\d\d\n.*\n.*\n\s*DeviceID=(?P<sensor>.*)\n.*\n.*\n.*\n\s*CurrentReading=(?P<reading>\d*)\n\s*SensorType=Temperature\n\s*HealthState=(?P<health>.*)\n`
Now my question is: Is there a better way to do it?
I explicitly mentioned each new line and white space group in the string. But can I just say /system.sensor\d\d.*DeviceID=(?P<sensor>.*)\n*.
(It didn't work for me, but I believe there should be a way to it.)
答案1
得分: 16
默认情况下,.
不匹配换行符。要改变这一点,可以使用s
标志:
(?s)/system.sensor\d\d.*DeviceID=(?P<sensor>.*)
来源:RE2正则表达式语法参考
(?flags)
在当前组中设置标志;非捕获组
s
- 使.
匹配\n
(默认为false)
英文:
By default .
does not match newlines. To change that, use the s
flag:
(?s)/system.sensor\d\d.*DeviceID=(?P<sensor>.*)
From: RE2 regular expression syntax reference
> (?flags)
set flags within current group; non-capturing
> s
- let .
match \n
(default false)
答案2
得分: 3
如果你想以更简洁的方式使用正则表达式来获取这些属性,首先你需要使用(?s)
[在Kobi的答案中的含义和用法]。然后对于每个属性,使用以下语法:
.*ExampleProperty=(?P<example>[^\n]*).*
:
.*
- "忽略"开头和结尾的所有文本(匹配,但不捕获);
ExampleProperty=
- 停止"忽略"文本;
(?P<example>...)
- 命名捕获组;
[^\n*]
- 匹配属性值直到找到换行符为止。
所以,这是一个简短的正则表达式,可以匹配你的文本并获取所有这些属性:
(?s)\/system.\/sensor\d\d.+DeviceID=(?P<sensor>[^\n]*).*CurrentReading=(?P<reading>[^\n]*).*SensorType=(?P<type>[^\n]*).*HealthState=(?P<health>[^\n]*).*
<sensor> = 37-Fuse
<reading> = 49
<type> = Temperature
<health> = Ok
[演示]: https://regex101.com/r/Awgqpk/1
英文:
If you want to get these properties using regex in a shorter way, you'd like to firstly use (?s)
[Meaning & use in Kobi's answer]. And for each property use this syntax:<br>
.*ExampleProperty=(?P<example>[^\n]*).*
:
>.*
- "Ignores" all text at the beginning and at the end (Match, but doesn't capture);
<br>ExampleProperty=
- Stop "ignoring" the text;
<br>(?P<example>...)
- Named capture group;
<br>[^\n*]
- Matches the value from the property till it find a new line character.
So, this is the short regex that shall match your text and get all these properties:
(?s)\/system.\/sensor\d\d.+DeviceID=(?P<sensor>[^\n]*).*CurrentReading=(?P<reading>[^\n]*).*SensorType=(?P<type>[^\n]*).*HealthState=(?P<health>[^\n]*).*
<b>
<sensor> = 37-Fuse
<reading> = 49
<type> = Temperature
<health> = Ok
[DEMO]: https://regex101.com/r/Awgqpk/1
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