input: Write a python function to crawl a website and extract specific data using regex.
  assert web_crawler('http://www.example.com') == ['data1', 'data2', 'data3']
  assert web_crawler('http://www.testsite.com') == ['info1', 'info2', 'info3']
  assert web_crawler('http://www.anotherexample.com') == ['item1', 'item2', 'item3']
output: import requests
  import re
  
  def web_crawler(url):
      response = requests.get(url)
      if response.status_code == 200:
          content = response.text
          # Regex to find patterns in the HTML content
          pattern = re.compile(r'(data\d|info\d|item\d)')
          matches = pattern.findall(content)
          return matches
      else:
          return []