feat: improve keyword matching with word boundaries

.github/workflows/auto-reply.yml

@@ -0,0 +1,54 @@
+name: Auto-reply to Assign Requests
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  auto-reply:
+    runs-on: ubuntu-latest
+    if: github.event.issue.pull_request == null
+    env:
+      KEYWORDS: "assign,work on this,take this up,pick this,want this"
+      RESPONSE_MESSAGE: "Please go ahead and create a PR when you are ready. We do not formally assign issues. Contributors are free to pick up any open issue based on their availability. You can open a PR or even a draft PR to let others know that you're working on it."
+    steps:
+      - name: Auto reply if assign keyword is used
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const commentBody = context.payload.comment.body;
+            const commenter = context.payload.comment.user.login;
+            const issueNumber = context.payload.issue.number;
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+
+            const keywords = process.env.KEYWORDS.split(',').map(k => k.trim());
+            const responseMessage = `@${commenter} ${process.env.RESPONSE_MESSAGE}`;
+
+            const matched = keywords.some(keyword => {
+              const escapedKeyword = keyword.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+              const regex = new RegExp(`\\b${escapedKeyword}\\b`, 'i');
+              return regex.test(commentBody);
+            });
+
+            if (!matched) return;
+
+            const comments = await github.rest.issues.listComments({
+              owner,
+              repo,
+              issue_number: issueNumber
+            });
+
+            const alreadyReplied = comments.data.some(c =>
+              c.user.type === 'Bot' && c.body.includes(`@${commenter}`)
+            );
+
+            if (alreadyReplied) return;
+
+            await github.rest.issues.createComment({
+              owner,
+              repo,
+              issue_number: issueNumber,
+              body: responseMessage
+            });