string Powershell 字符串不包含
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Powershell string does not contain
提问by Grady D
I have some code that takes in a string,
我有一些接受字符串的代码，
Foreach($user in $allUsers){
if($user.DisplayName.ToLower().Contains("example.com") -or $user.DisplayName.ToLower()) {
} else {
$output3 = $externalUsers.Rows.Add($user.DisplayName)
}
}
Part of the ifright after the -orI need to check if the string does not contain an @ sign. How can I check to see if the @ sign is missing?
我需要检查字符串是否不包含@符号if之后的部分右侧-or。如何检查@符号是否丢失？
回答by Mathias R. Jessen
There are a million ways to do it, I would probably go for the following due to readability:
有一百万种方法可以做到这一点，由于可读性，我可能会选择以下方法：
$user.DisplayName -inotmatch "@"
The -matchoperator does a regex match on the the left-hand operand using the pattern on the right-hand side.
该-match运营商确实在左手操作使用在右侧的模式正则表达式匹配。
Prefixing it with imake it explicitly case-insensitive, and the notprefix negates the expression
用前缀它i使其明确区分我nsensitive，和not前缀否定表达
You could also do:
你也可以这样做：
-not($user.DisplayName.ToLower().Contains("@"))
or
!$user.DisplayName.ToLower().Contains("@")
For simple wildcard text-matching (maybe you hate regex, what do I know?):
对于简单的通配符文本匹配（也许你讨厌正则表达式，我知道什么？）：
$user.DisplayName -notlike "*@*"
Or alternatively look for the substring with IndexOf;
或者使用 IndexOf 查找子字符串；
$user.DisplayName.IndexOf("@") -eq (-1)
