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Editorial Team
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Asked: 2026-06-13T04:41:43+00:00

I have the following <RegexMatch Input=$(Configuration) Expression=^.*?(?=\.)> <Output ItemName=Theme TaskParameter=Output /> </RegexMatch> My configuration

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I have the following 

<RegexMatch Input="$(Configuration)" Expression="^.*?(?=\.)">
   <Output ItemName="Theme" TaskParameter="Output" />
</RegexMatch>

My configuration variable is as follows Theme.Environment

So “Default.Debug”
or “Yellow.Release”

I would like to get the first portion in to a varaible called theme.
I have tested this regex and it works in stand alone regex testers

^.*?(?=\.)

but not when used in my build file.

I am echoing the variable out so that i can see the output

<Exec Command="echo $(Theme)"/>
<Exec Command="echo $(Configuration)"/>

Ideas?

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1 Answer

  1. Editorial Team

    Just realised that RegexMatch doenst return the matched string but rather returns the entire string if matched.

    basically it called IsMatch method not Match method

    Have re written as a RegexReplace

    <RegexReplace Input="$(Configuration)" Expression="\..*" Replacement="" Count="1">
    <Output ItemName="Theme" TaskParameter="Output" />
</RegexReplace>

    After that it still wasnt working and then i realised i was doing 

    $(Theme)

    Should have been 

    @(Theme)
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