Regular Expression to match a string, that doesn't end in a certain string

Question

I an trying to write a regular expression to be used as part of a replace operation.

I have many paths as follows:

<ProjectReference Include="..\Common.Workflow\Common.Workflow.csproj">
<ProjectReference Include="..\Common.Workflow\Common.Workflow.Interfaces\Common.Workflow.Interfaces.csproj">
<ProjectReference Include="..\Common.Workflow\Common.Workflow.Persistence\Common.Workflow.Persistence.csproj">
<ProjectReference Include="..\Common.Workflow\Common.Workflow.Process\Common.Workflow.Process.csproj">

I need to replace the Common.Workflow\ in all cases except where the it contains Common.Workflow.csproj.

I am moving these files as part of a code clean up.

Do you mean you want to do this in Visual Studio, or programmatically? VS regexes are fundamentally different from .NET regexes. — Tim Pietzcker
– Tim Pietzcker, Commented Sep 25, 2011 at 21:29

rid · Accepted Answer · 2011-09-25 21:26:25Z

4

Replace Common\.Workflow\\(?!Common\.Workflow\.csproj) with what you need.

answered Sep 25, 2011 at 21:26

rid

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Bohemian · Accepted Answer · 2011-09-25 21:33:33Z

2

Use a negative look-ahead and a negative look-behind, like this:

(?<!.*Common.Workflow.csproj)Common.Workflow\\(?!.*Common.Workflow.csproj)

Explanation:

(?<!.*Common.Workflow.csproj) means "Common.Workflow.csproj must not appear before the match
(?!.*Common.Workflow.csproj) means "Common.Workflow.csproj must not appear after the match"

This regex will prevent matching if Common.Workflow.csproj appears anywhere in the input (you didn't specify that the negative match only appears after the search)

answered Sep 25, 2011 at 21:33

Bohemian♦

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