title: Find rows numbers, add 1, then replace string
body: <p>I have rows similar to this</p>
  
  <p><code>a:1:{s:5:"value";s:69:"https://www.mypage.com/files/products/product.jpg";}</code></p>
  
  <p>I would like to extract the number 69, add 1 and replace whole string with </p>
  
  <p><code>a:1:{s:5:"value";s:70:"https://www.mypage.com/files/products/product.jpg";}</code></p>
  
  <p>How to approach this? Is this possible to do in mysql?</p>
  
  <p>I use mysql 5.5. </p>
  
  <p>Thank you.</p>