Extracting Comment Count from Page Title

Yahoo News comments page shows total comment count in the page title.

Page Title Format

(123)件のコメント - Yahoo!ニュース

Pattern: (NUMBER)件のコメント

Extraction Method

const commentData = await page.evaluate(() => {
  let totalComments = 0;
  const titleMatch = document.title.match(/(\d+)件のコメント/);

  if (titleMatch) {
    totalComments = parseInt(titleMatch[1], 10);
  }

  return { totalComments };
});

Regex Breakdown

• (\d+) - Captures one or more digits
• 件のコメント - Matches "件のコメント" (counter word for comments)

Complete Example

function extractCommentCount(pageTitle: string): number {
  const match = pageTitle.match(/(\d+)件のコメント/);
  return match ? parseInt(match[1], 10) : 0;
}

// Usage
const totalComments = extractCommentCount(document.title);
console.log(totalComments); // 123

Notes

• Returns 0 if no match found
• Japanese counter word "件" is used for comments
• Page title is the most reliable source for total count
• Individual comment extraction may return fewer comments (pagination limits)