Powershell 反向替换正则表达式

Question

Powershell 7.0 Script: I want to reverse a regex that I used in replace .

I have something like this:

$a = $_.BaseName -replace 'REGEX', ''

The names here are in this pattern (random are random characters and numbers with different length):

random A00B00 random

where the numbers are all diffrent. I can use A[0-9][0-9]B[0-9] to match what I want, but then, I replace only what I want.

I want that the string after the command is A00B00 and not random random .

I tried diffrent regex but nothing worked for me

Answer 1

You have a few options to achive what you're looking for.

One way to go would be to use regex look around and replace what you not want:

'random A00B00 random' -replace '(?<=^).*(?=A\d{2}B\d{2})' -replace '(?<=A\d{2}B\d{2}).+'

Or you use a back reference and replace your string with a part of the original string, matched in a regex capture group:

'random A00B00 random' -replace '.+(A\d{2}B\d{2}).+','$1'