title: Join two regex from sed
body: <p>I'm trying to replace all words with sed between two <code>/</code> characters that is in a line which begins with a <code>+</code> character. I can find the lines that interest me with the following grep:</p>
  
  <pre><code>grep -e "^+" add_prefix.patch | grep -e "/myString/
  </code></pre>
  
  <p>I would to replace the word "myString" with the word "otherString". Can I somehow join the above two regular expressions in sed?</p>