PowerShell 字符串替换 | PowerShell 字符串替换的前 8 个示例

PowerShell 字符串替换简介

字符串操作是任何编程语言不可或缺的一部分。字符串函数是 PowerShell 不可或缺的一部分，有各种函数可以处理与字符串操作相关的任务。在PowerShell中，一切都是对象，字符串也是System.String类型的对象。要删除字符串的特定部分或将部分或整个字符串替换为其他文本，可以使用 PowerShell 中的 Replace cmdlet 来实现。替换函数将字符串中要替换的文本作为参数，并将必须替换所需文本的文本作为另一个参数。本文将通过示例详细介绍替换 cmdlet。

语法：

Replace(strOldChar, strNewChar)

• Stroldchar：要查找的字符
• Strnewchar： 要替换找到的文本的字符。

实施 PowerShell 字符串替换的示例

以下是 PowerShell 字符串替换的示例：

例子#1

代码：

Write-Host "replacing a text in string"
$test=" old text to be replaced"
Write-Host "going to replace old"
$test.Replace("old","New")
Write-Host "Text is replaced"

输出：

例子#2

代码：

Write-Host "Welcome to Replace function demo in PowerShell"
Write-Host "Demo of single text replacement"
$input="Vignesh Krishnakumar"
Write-Host "Actual text before replace is" $input
Write-Host "The below code will replace vignesh with Viki"
#replace function
$input=$input -replace "vignesh","Viki"
Write-Host "Replaced text is" $input
Write-Host "Replace using replace function"
$input1="this is a nice day"
Write-Host "The actual text is" $input1
Write-Host "The below will replace this with that"
#replace function
$input1=$input1.Replace("this","That")
Write-Host "After replace" $input1
Write-Host "Demo of multiple replace simultaneosly"
$actual="Australia won the world cup in 1999"
#multiple replacement
$actual -replace "Australia","1999" -replace "lost", "-"

输出：

使用哈希表替换

同时替换多个文本的另一种有效方法是使用哈希表。哈希表是一种数组类型，它将值存储为键值对。键值必须是唯一的，值可以是非唯一的。哈希表的内置属性是键、值和计数。在使用哈希表替换文本的情况下，键将表示要替换的文本，值将表示要用于替换的文本值。

语法：

$hashtable=@
{
Text1=value1;
Text2=value2;
Text3=value3;
Text4=value4
}

哈希表的值可以按如下方式更改。

• 要将新对添加到哈希表：

$hashtable.Add(“text5”,”value5”)

• 编辑值：

$hashtable.Set_Item(“text5”,”value6”)

或者

$hastable.”text5”=”value6”

• 删除值：

$hashtable.Remove(“text5”)

• 显示哈希表：

$hashtable

例子#3

代码：

Write-Host "Welcome to demo of replace using hashtable"
$input="Am from chennai. I work as a freelancer. This is my hobby. This is an example. Let us see how text are replaced"
Write-Host "Text before replacing `n" $input -ForegroundColor Yellow
$hashtable = @{}
$hashtable.'Am'='We'
$hashtable.'This'='That'
$hashtable.'is'='was'
$hashtable.'us'='we'
$hashtable.'.'='!'
Write-Host "The hashtable keys are as follows `n" $hashtable.Keys  -ForegroundColor Yellow
Write-Host "The hashtable values are as follows `n" $hashtable.Values  -ForegroundColor Yellow
#iterate the input string and replace the values
Foreach ($key in $hashtable.Keys) {
$input = $input.Replace($key, $hashtable.$key)
}
Write-Host "After replacement" $input -ForegroundColor Yellow
Write-Host "Demo of replacing numbers and special characters"
$input1="this 1 35 78 90. Example of replacing numbers. % * # $. 12 34 56 78"
Write-Host "Text before replacing `n" $input1 -ForegroundColor Yellow
$hashtable1 = @{}
$hashtable1.'35'='350'
$hashtable1.'78'='780'
$hashtable1.'90'='900'
$hashtable1.'%'='replced'
$hashtable1.'*'='sfdsfdsfds'
$hashtable1.'#'='####'
Foreach ($key in $hashtable1.Keys) {
$input1 = $input1.Replace($key, $hashtable1.$key)
}
Write-Host "After replacement" $input1 -ForegroundColor Yellow

输出：

例子#4

代码：

Write-Host "Replacing a multiple text"
$string="my name is billa, vazhaikai elam naanum super"
$string-replace "vazhikai", "replaced" -replace "elam", "All"
Write-Host "Replacing a text in a file"
(Get-Content -path C:\Users\educba.txt -Raw) -replace 'was','is'
Write-Host "text in the file is replaced"

输出：

例子#5

代码：

Write-Host "Example of replacing a text in a file"
$filePath = 'C:\Users\educba.txt'
$find='this'
$replace='that'
$file=Get-Content -Path $filePath
Write-Host "The contents of the file are `n" $file -ForegroundColor Yellow
(Get-Content $filePath) -replace $Find, $Replace | Add-Content -Path $filePath
$newtext=Get-Content -Path $filePath
Write-Host "Now the text in the file is" $newtext -ForegroundColor Yellow

输出：

例子#6

代码：

Write-Host "Welcome to string comparison"
$test=" STRINGsdfsdfdsfdsf DEMO"
$test1="stringDDDDDDDD demo"
Write-Host "Comaprison using equal method"
$test.Equals($test1)
$test.ToLower.Equals($test1)
$test.Equals($test1,1)
Write-Host "Comaprison using comaprison method"
$test.CompareTo($test1)

输出：

例子#7

代码：

Write-Host "Replacing using regex expression"
$input="192.10.145.30.456"
Write-Host "Input is `n" $input -ForegroundColor Yellow
Write-Host "Using regex going to replace all trwo digits with **"
$input=$input -replace "\.\d{2}\.","**"
Write-Host "After replacing `n" $input -ForegroundColor Yellow
Write-Host "Example to show interchanging of names"
$input= "Vignesh Krishnakumar"
Write-Host "Going to replace using regex and swap"
$input= $input -replace "([a-z]+)\s([a-z]+)",'$2, $1'
Write-Host "after swap `n" $input -ForegroundColor Yellow

输出：

例子#8

其他常用的字符串函数：

.Split()

这是另一种可用于将字符串拆分为子字符串的方法。

语法：

.Split(strSeparator [, MaxSubstrings] [, Options])
String -Split strSeparator [, MaxSubstrings] [, Options]
String -Split {scriptblock} [, MaxSubstrings]
-Split String
strSeparator: It is character of identification to split the string
MaxSubstrings: The maximum number of substrings that can be generated

代码：

Write-Host "generating substring using split method"
$teststring="my name is vignesh- am from chennai"
Write-Host "splitting using - character"
$teststring -split "-"
$teststring="domainname\username"
Write-Host "Splitting using \ character"
$teststring -split "\"
Write-Host "generating substring using space"
$string="string1 string2 strin3"
$string.Split("")
Write-Host "splitting using multiple separators"
$string="domain\systems-test"
$string.Split("\").Split("-")

输出：

结论

因此，本文详细介绍了PowerShell中的字符串替换功能。该文章解释了替换字符串的各种方法。它通过示例详细介绍了如何同时替换多个文本、如何使用哈希表来替换文本、如何用适当的示例替换文件中的字符串。它还详细解释了如何使用正则表达式来替换字符串中的文本。它还介绍了 PowerShell 中的 split 方法。本文还解释了如何在哈希表中存储多个值以及如何使用它来替换字符串中的文本。了解更多信息的最佳方法是尝试其他各种方法并在示例脚本中进行练习。