[英]Splitting of a string using Regex
I have string of the following format: 我有以下格式的字符串:
string test = "test.BO.ID";
My aim is string that part of the string whatever comes after first dot. 我的目标是在第一个点之后加上字符串,即字符串的一部分。 So ideally I am expecting output as "BO.ID". 因此,理想情况下,我期望输出为“ BO.ID”。
Here is what I have tried: 这是我尝试过的:
// Checking for the first occurence and take whatever comes after dot
var output = Regex.Match(test, @"^(?=.).*?");
The output I am getting is empty. 我得到的输出为空。
What is the modification I need to make it for Regex? 我需要对正则表达式进行哪些修改?
You get an empty output because the pattern you have can match an empty string at the start of a string, and that is enough since .*?
您将得到一个空输出,因为您拥有的模式可以在字符串的开头匹配一个空字符串,并且自.*?
开始就足够了.*?
is a lazy subpattern and .
是一个懒惰子模式,并且.
matches any char. 匹配任何字符。
Use (the value will be in Match.Groups[1].Value
) 使用(该值将在Match.Groups[1].Value
)
\.(.*)
or (with a lookahead, to get the string as a Match.Value
) 或(先行查找,以将字符串作为Match.Value
)
(?<=\.).*
See the regex demo and a C# online demo . 请参阅regex演示和C#在线演示 。
A non-regex approach can be use String#Split
with count
argument ( demo ): 非正则表达式方法可以与带有count
参数( demo )的String#Split
一起使用:
var s = "test.BO.ID";
var res = s.Split(new[] {"."}, 2, StringSplitOptions.None);
if (res.GetLength(0) > 1)
Console.WriteLine(res[1]);
如果只需要第一个点之后的部分,则根本不需要正则表达式:
x.Substring(x.IndexOf('.'))
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