在使用正则表达式匹配模式后排除 substring

Question

I want to write a regex that splits a string such as only few elements are selected. For example: M:\Shares\Profiles\Server\Profiles\abcd.contoso.V2.01

the result I am aiming for is:

abcd.V2.01 , so that the domain name ie 'contoso' is dropped

However, I am unable to exclude a part of the string after a match is found. I tried

$original = 'M:\Shares\Profiles\Server\Profiles\abcd.contoso.V2.01'
$modified = $original -replace '.*\\([^\\.]+.contoso.V2)[^\\]*$', '$1'

that returns $modified as 'abcd.contoso.V2'

Answer 1

You can use two capturing groups:

$original = 'M:\Shares\Profiles\Server\Profiles\abcd.contoso.V2.01'
$original -replace '.*\\([^\\.]*)\.contoso(\.V2[^\\]*)$', '$1$2'
# => abcd.V2.01

Do not forget to escape literal dots in the regex pattern. Here is a demo of the above regex . Details :

• .* - any zero or more chars other than LF chars
• \\ - a \ char
• ([^\\.]*) - Group 1 ( $1 ): any zero or more chars other than \ and .
• \.contoso - a .contoso string
• (\.V2[^\\]*) - Group 2 ( $2 ): .V2 string and then any zero or more chars other than \
• $ - end of string.