diff --git a/dist/index.js b/dist/index.js
index bc18a95..3b7db4b 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -16797,14 +16797,15 @@ class DotNetVersionInfo {
     constructor(version) {
         this.isExactVersionSet = false;
         this.inputVersion = version;
-        // Check for exact match
-        if (semver.valid(semver.clean(version) || '') != null) {
+        //Note: No support for previews when using generic
+        let parts = version.split('.');
+        // Check for exact match, and that there are at least 3 parts to the version (preview/rc versions have more than 3 parts)
+        if (semver.valid(semver.clean(version) || '') != null &&
+            parts.length >= 3) {
             this.fullversion = semver.clean(version);
             this.isExactVersionSet = true;
             return;
         }
-        //Note: No support for previews when using generic
-        let parts = version.split('.');
         if (parts.length < 2 || parts.length > 3)
             this.throwInvalidVersionFormat();
         if (parts.length == 3 && parts[2] !== 'x' && parts[2] !== '*') {
@@ -16916,6 +16917,7 @@ class DotnetCoreInstaller {
             }
             if (process.env['DOTNET_INSTALL_DIR']) {
                 core.addPath(process.env['DOTNET_INSTALL_DIR']);
+                core.exportVariable('DOTNET_ROOT', process.env['DOTNET_INSTALL_DIR']);
             }
             else {
                 if (IS_WINDOWS) {
@@ -16926,6 +16928,7 @@ class DotnetCoreInstaller {
                 else {
                     // This is the default set in install-dotnet.sh
                     core.addPath(path.join(process.env['HOME'] + '', '.dotnet'));
+                    core.exportVariable('DOTNET_ROOT', path.join(process.env['HOME'] + '', '.dotnet'));
                 }
             }
             console.log(process.env['PATH']);
diff --git a/src/installer.ts b/src/installer.ts
index 66032fc..5ef810f 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -21,17 +21,20 @@ export class DotNetVersionInfo {
   constructor(version: string) {
     this.inputVersion = version;
 
-    // Check for exact match
-    if (semver.valid(semver.clean(version) || '') != null) {
+    //Note: No support for previews when using generic
+    let parts: string[] = version.split('.');
+
+    // Check for exact match, and that there are at least 3 parts to the version (preview/rc versions have more than 3 parts)
+    if (
+      semver.valid(semver.clean(version) || '') != null &&
+      parts.length >= 3
+    ) {
       this.fullversion = semver.clean(version) as string;
       this.isExactVersionSet = true;
 
       return;
     }
 
-    //Note: No support for previews when using generic
-    let parts: string[] = version.split('.');
-
     if (parts.length < 2 || parts.length > 3) this.throwInvalidVersionFormat();
 
     if (parts.length == 3 && parts[2] !== 'x' && parts[2] !== '*') {
@@ -163,6 +166,7 @@ export class DotnetCoreInstaller {
 
     if (process.env['DOTNET_INSTALL_DIR']) {
       core.addPath(process.env['DOTNET_INSTALL_DIR']);
+      core.exportVariable('DOTNET_ROOT', process.env['DOTNET_INSTALL_DIR']);
     } else {
       if (IS_WINDOWS) {
         // This is the default set in install-dotnet.ps1
@@ -176,6 +180,10 @@ export class DotnetCoreInstaller {
       } else {
         // This is the default set in install-dotnet.sh
         core.addPath(path.join(process.env['HOME'] + '', '.dotnet'));
+        core.exportVariable(
+          'DOTNET_ROOT',
+          path.join(process.env['HOME'] + '', '.dotnet')
+        );
       }
     }