Powershell 正则表达式获取字符串的一部分 [英] Powershell Regex expression to get part of a string

问题描述

我想取出一个字符串的一部分以在其他地方使用它.例如，我有以下字符串:

I would like to take part of a string to use it elsewhere. For example, I have the following strings:

• 项目 XYZ 是项目名称 - 20-12-11

我想获取值XYZ 是项目名称"；从字符串.项目"二字和字符-"在号码永远存在之前.

I would like to get the value "XYZ is the project name" from the string. The word "Project" and character "-" before the number will always be there.

推荐答案

我认为 lookaround 正则表达式在这里可以工作，因为Project"和-"一直都在:

I think a lookaround regular expression would work here since "Project" and "-" are always there:

(?<=Project ).+?(?= -)

环视对于处理获取子字符串的情况很有用.

A lookaround can be useful for cases that deal with getting a sub string.

说明:

• (?<= = 负向后视
• 项目 = 起始字符串(包括空格)
• ) = 关闭负向后视
• .+? = 匹配介于两者之间的任何内容
• (?= = 正向预测
• - = 结束字符串
• ) = 关闭正向预测

• (?<= = negative lookbehind
• Project = starting string (including space)
• ) = closing negative lookbehind
• .+? = matches anything in between
• (?= = positive lookahead
• - = ending string
• ) = closing positive lookahead

PowerShell 中的示例:

Example in PowerShell:

Function GetProjectName($InputString) {
    $regExResult = $InputString | Select-String -Pattern '(?<=Project ).+?(?= -)'
    $regExResult.Matches[0].Value
}

$projectName = GetProjectName -InputString "Project XYZ is the project name - 20-12-11"
Write-Host "Result = '$($projectName)'"

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