如何忽略字母/单词? [英] How to ignore letters/words?

问题描述

假设我有以下代码:

$size = 23.9
$size = "$size GB"
write $size

我想在其他事情上使用相同的变量，即

i want to use the same variable for other things, i.e.

if ($size -lt 20)
{...}

这显然是一个问题，因为 $size 这里有 GB/is a string

this will obviously be an issue because $size here has GB/is a string

如何忽略字符串部分?

我正在寻找这样的东西:

i am looking for something like this:

if($($size -replace ("anything after the numbers", "")) -lt 20)
{....}

推荐答案

如果您坚持使用字符串并保持使用 -replace 运算符，您可以使用以下方法:

If you insist on working with a string and keeping with the -replace operator, you can use the following:

[double]($size -replace "[^\d\.]+$")

如果您维护一个数值类型，例如 int 或 double，您可以使用其他方法来处理您的数据.你仍然可以输出一个字符串，同时保持 $size 为双精度.

If you maintain a numeric value type like int or double, you can use other means to work with your data. You can still output a string while keeping $size a double.

$size = 23.9
$unit = 'GB'
"{0} {1}" -f $size,$unit
23.9 GB

与上述示例非常相似的概念是将 $size 创建为自定义对象.

A very similar concept as the above example would be to create $size as a custom object.

$size = [pscustomobject]@{Size = 23.9; Unit = 'GB'}
"{0} {1}" -f $size.Size,$size.Unit

您可以进行动态单元分配.如果我们假设您从字节大小开始，您可以分配单位并进行转换.

You can do dynamic unit assignment. If we assume you are starting with a size in bytes, you can assign the unit and do the conversion.

if ($size -ge 1GB)
{
    $newSize = [pscustomobject]@{
        Size = $size/1GB; Unit = 'GB'
    }
}
elseif ($size -ge 1MB)
{
    $newSize = [pscustomobject]@{
        Size = $size/1MB; Unit = 'MB'
    }
}
elseif ($size -ge 1KB)
{
    $newSize = [pscustomobject]@{
        Size = $size/1KB; Unit = 'KB'
    }
}
else
{
    $newSize = [pscustomobject]@{
        Size = $size; Unit = 'B'
    }
}

这篇关于如何忽略字母/单词?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！