Fix regex in preview removal

Jenkinsfile

@@ -72,7 +72,7 @@ pipeline {
         deployPreview action: 'cleanup'
         sh "nomad alloc exec -task calendar-dev -job calendar-dev npx -y prisma migrate deploy --schema lib/db/schema.prisma"
         script {
-          def mergedPullRequest = sh "git log --oneline -2 --pretty=%B | head -n 1 | grep -oP '#(\d+)(?!.*#[1-9][0-9]*)' | sed 's/#//'"
+          def mergedPullRequest = sh "git log --oneline -2 --pretty=%B | head -n 1 | grep -oP '#([1-9][0-9]*)(?!.*#[1-9][0-9]*)' | sed 's/#//'"
           if (mergedPullRequest != "") {
             oldJobID = sh script: "consul kv get 'pr-deployments/${currentBuild.projectName}/PR-${mergedPullRequest}' || true", returnStdout: true
             if (oldJobID.length() > 0) {