title: Extract websites links from a text in R
body: <p>I have multiple texts that each may consist references to one or more web links. for example:</p>
  
  <pre><code> text1= "s@1212a as www.abcd.com asasa11". 
  </code></pre>
  
  <p>How do I extract:</p>
  
  <pre><code>   "www.abcd.com" 
  </code></pre>
  
  <p>from this text in R? In other words I am looking to extract patterns that start with <code>www</code> and end with <code>.com</code> </p>