Replace [^a-zA-Z0-9-] with - in BranchName variable. Otherwise the branch name variable can never be used in any SemVer spec since it can contain a / when using nested branches.

Author: KiLLeRRaT

src/GitVersionCore/OutputVariables/VariableProvider.cs

@@ -5,6 +5,7 @@
 using GitVersion.VersioningModes;
 using GitVersion.Configuration;
 using GitVersion.Helpers;
+using GitVersion.Extensions;
 
 namespace GitVersion.OutputVariables
 {
@@ -71,7 +72,7 @@ public VersionVariables GetVariablesFor(SemanticVersion semanticVersion, Effecti
                 semverFormatValues.BuildMetaData,
                 semverFormatValues.BuildMetaDataPadded,
                 semverFormatValues.FullBuildMetaData,
-                semverFormatValues.BranchName,
+                semverFormatValues.BranchName?.RegexReplace("[^a-zA-Z0-9-]", "-"),
                 semverFormatValues.Sha,
                 semverFormatValues.ShortSha,
                 semverFormatValues.MajorMinorPatch,