# 定义要检查的字符串$myString="Hello123World"# 使用正则表达式匹配数字$containsNumber=$myString-match"\d"# 输出结果if($containsNumber){Write-Host"字符串包含数字"}else{Write-Host"字符串不包含数字"} 解释: 首先,我们定义了一个要检查的字符串$myString,这里假设
Check if string contains invalid characters Check if string starts with letter/character. check installed memory with physical memory Check network drive connection Check object property existance check PKI certificate expiration Check string for two special characters back to back Check to see if user ...
The<result-to-be-matched>is an expression whose value is compared to the input value. Expressions include literal values (strings or numbers), variables, and scriptblocks that return a boolean value. For an example, seeImpact of string conversionlater in this article. ...
If the literal contains a decimal point or the e-notation, the literal string is parsed as a real number. If the decimal-suffix is present then directly into[decimal]. Else, parse as[double]and apply multiplier to the value. Then check the type suffixes and attempt to cast into appropriat...
Variable names in PowerShell start with a dollar sign and contain a mix of numbers, letters, symbols and spaces. For instance,$var="HELLO"stores the stringHELLOin the$varvariable. As another example, the previous code instance uses the variable$ito hold the value evaluated within theforloop....
In fact, this week we’re going to do something very similar. One seeming-advantage of a graphical-oriented application is that it’s easy to constrain a user to a finite set of choices: if you display a message box that contains onlyYesandNobuttons, well, at that point it’s difficult...
On Unix, only positive numbers between [byte]::MinValue and [byte]::MaxValue are allowed. A negative number in the range of -1 through -255 is automatically translated into a positive number by adding 256. For example, -2 is transformed to 254....
If the value contains spaces, enclose the value in quotation marks ("). Expand table Type: String Position: Named Default value: None Required: False Accept pipeline input: False Accept wildcard characters: False Applies to: Exchange Server 2010, Exchange Server 2013, Exchange Server 2016, ...
If you work with database types, you may get back a[dbnull]::Valuewhich is equivalent to$nullwithin the database, but in PowerShell, this was not equal to$nullso you can’t compare it directly. This change fromJoel Sallowallows you to compare both[dbnull]::Valueand[nullstring]::Valu...
Speaking of metadata, you can get another view into which version is currently presented as being in %WinDir% by using fsutil.exe. The full SxS path also contains a version indicator. Now go forth and correctly judge Windows binary version numbers!