ECMAScript正则适配解析问题：修正正则并限制循环结果数

Let's break down and fix your problems step by step:

1. Corrected Regex with Required Captures #

First, your original regex had a duplicate <td class='s'> which was likely causing it to fail. I've fixed that, plus added captures for seeders, leechers, upload date, and the class="rN" attribute. The regex now aligns with your expected match groups:

var re = /<img src="([\s\S]*?)"[\s\S]*?<td class="nam"><a href="([\s\S]*?)"[\s\S]*?>([\s\S]*?)<\/a>[\s\S]*?<td class='s'>([\s\S]*?)<\/td><td class='sl_s'>(\d+)<\/td><td class='sl_p'>(\d+)<\/td>[\s\S]*?<td class='date'>([\s\S]*?)<\/td>[\s\S]*?(class="r\d+")/g;

Explanation of Match Groups: #

• Match[1]: Image source URL
• Match[2]: Link href attribute
• Match[3]: Link text
• Match[4]: File size (e.g., 6ГБ)
• Match[5]: Seeders count (e.g., 11)
• Match[6]: Leechers count (e.g., 0)
• Match[7]: Upload date/time (e.g., 10.08.2013 в 22:29)
• Match[8]: Row class (e.g., class="r1")

Key Fixes & Additions: #

• Removed the duplicate <td class='s'> that was breaking the original regex
• Replaced hardcoded \d with (\d+) to capture seeders/leechers as numeric groups
• Added a capture for the date field (adjust the class='date' part if your HTML uses a different class name)
• Added a capture for the class="rN" attribute (adjust the position if this class is on a different element like the parent <tr>)

2. Fixing the Result Limit Loop #

Your loop wasn't working because you likely weren't re-executing the regex in each iteration, or not properly incrementing the entry count. Here's the corrected loop logic that limits results to 50:

function scraper_search(html) {
  var re = /<img src="([\s\S]*?)"[\s\S]*?<td class="nam"><a href="([\s\S]*?)"[\s\S]*?>([\s\S]*?)<\/a>[\s\S]*?<td class='s'>([\s\S]*?)<\/td><td class='sl_s'>(\d+)<\/td><td class='sl_p'>(\d+)<\/td>[\s\S]*?<td class='date'>([\s\S]*?)<\/td>[\s\S]*?(class="r\d+")/g;
  var match;
  var entries = [];
  
  // Loop until no more matches or we hit 50 entries
  while ((match = re.exec(html)) !== null && entries.length < 50) {
    entries.push({
      imgSrc: match[1],
      linkHref: match[2],
      linkText: match[3],
      size: match[4],
      seeders: match[5],
      leechers: match[6],
      uploadDate: match[7],
      rowClass: match[8]
    });
  }
  
  return entries;
}

Why This Works: #

• We use re.exec(html) directly in the loop condition to get the next match each iteration
• We check entries.length < 50 to stop once we've collected 50 results
• The regex's global flag (g) ensures exec() moves to the next match each time

Notes for Adjustment: #

• If the class="rN" is on the parent <tr> instead of inside the row, adjust the regex to start with <tr (class="r\d+")[\s\S]*? (you'll need to reorder the match groups accordingly)
• If the date is in a different HTML element (not <td class='date'>), update that part of the regex to match your actual HTML structure

内容的提问来源于stack exchange，提问作者fil brinza