fixing workflow

Author: TLSDC

.github/workflows/pypi.yml

@@ -35,7 +35,6 @@ jobs:
 
     publish-to-pypi:
       name: Publish to PyPI
-      if: startsWith(github.ref, 'refs/tags/') && contains(github.ref_name, 'v') && github.ref_name matches '^v[0-9]+\.[0-9]+\.[0-9]+(\.dev[0-9]+)?$' 
       needs:
         - build
       runs-on: ubuntu-22.04
@@ -44,6 +43,24 @@ jobs:
         id-token: write  # IMPORTANT: mandatory for trusted publishing
 
       steps:
+        - name: Extract tag name
+          run: echo "TAG_NAME=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+
+        - name: Validate tag format
+          id: validate_tag
+          run: |
+            if [[ "${{ env.TAG_NAME }}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(\.dev[0-9]+)?$ ]]; then
+              echo "valid=true" >> $GITHUB_ENV
+            else
+              echo "valid=false" >> $GITHUB_ENV
+            fi
+
+        - name: Exit if invalid tag
+          if: env.valid == 'false'
+          run: |
+            echo "The tag ${{ env.TAG_NAME }} is not a valid semantic version. Exiting."
+            exit 1
+
         - name: Download all the distribution packages
           uses: actions/download-artifact@v4
           with: