使用PowerShell 4.0从变量输入中删除空格 [英] Removing spaces from a variable input using PowerShell 4.0

问题描述

我已经尝试了一些方法，但是由于某些原因它们似乎没有起作用.

I've tried a few things already but they don't seem to work for some reason.

基本上我想做的是让用户使用 读取主机" cmdlet，然后将其删除任何空格.

Basically what I'm attempting to do is have a user input a value using the "Read-host" cmdlet, then strip it of any spaces.

我尝试过:

$answer = read-host
$answer.replace(' ' , '""')

并且:

$answer = read-host
$answer -replace (' ')

我可能会错过一些确实很明显的东西，但是如果有人可以帮助我或向我展示实现这一目标的更简单方法，我将不胜感激.

I'm probably missing something really obvious, but if anyone could help me out or show me an easier way to achieve this I would appreciate it.

我本来打算将变量通过管道传递给命令并以这种方式剥离它，但是我看过的所有示例都没有用，尽管它们看起来很简单.

I was going to pipeline the variable to a command and strip it in that fashion, but none of the examples I've seen work, although they look much easier.

推荐答案

Replace运算符的意思是用其他东西代替；不要与删除功能混淆.

The Replace operator means Replace something with something else; do not be confused with removal functionality.

此外，您还应该将运算符处理后的结果发送到变量或其他运算符. .Replace()和-replace都不会修改原始变量.

Also you should send the result processed by the operator to a variable or to another operator. Neither .Replace(), nor -replace modifies the original variable.

要删除所有空格，请使用'用空字符串替换任何空格符号'

To remove all spaces, use 'Replace any space symbol with empty string'

$string = $string -replace '\s',''

要删除行首和末尾的所有空格，并将所有重复的空格或制表符替换为空格键，请使用

To remove all spaces at the beginning and end of the line, and replace all double-and-more-spaces or tab symbols to spacebar symbol, use

$string = $string -replace '(^\s+|\s+$)','' -replace '\s+',' '

或更本地的System.String方法

$string = $string.Trim()

最好使用

Regexp，因为' '仅表示空格键"符号，而'\s'表示空格键，制表符和其他空格符号".请注意，$string.Replace()进行'Normal'替换，而$string -replace进行RegEx替换，这更重但是功能更多.

Regexp is preferred, because ' ' means only 'spacebar' symbol, and '\s' means 'spacebar, tab and other space symbols'. Note that $string.Replace() does 'Normal' replace, and $string -replace does RegEx replace, which is more heavy but more functional.

请注意，RegEx具有一些特殊符号，例如点(.)，花括号([]())，斜杠(\)，帽子(^)，数学符号(+-)或美元符号( $)确实需要转义. ('my.space.com' -replace '\.','-' => 'my-space-com'.必须小心在右侧使用带有数字(例如$1)的美元符号

Note that RegEx have some special symbols like dot (.), braces ([]()), slashes (\), hats (^), mathematical signs (+-) or dollar signs ($) that need do be escaped. ( 'my.space.com' -replace '\.','-' => 'my-space-com'. A dollar sign with a number (ex $1) must be used on a right part with care

'2033' -replace '(\d+)',$( 'Data: $1')
Data: 2033

更新:您还可以将$str = $str.Trim()以及TrimEnd()和TrimStart()一起使用.在 System.String 中了解更多信息MSDN页面.

UPDATE: You can also use $str = $str.Trim(), along with TrimEnd() and TrimStart(). Read more at System.String MSDN page.

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