title: Check if string contains single backslashes with regex
body: <p>I have tried to fix this for a long time, and i just can't do it.</p>
  
  <p>It could be any string, but this is an example: </p>
  
  <pre><code>"\This string \contains some\ backslashes\"
  </code></pre>
  
  <p>I need to make a regex that i can use to check that the string contains single backslashes.</p>
  
  <p>I then need to convert the given string into (i can do the conversion): </p>
  
  <pre><code>"\\This string \\contains some\\ backslashes\\"
  </code></pre>
  
  <p>And then use regex to check that the string no long contains single backslashes.</p>
  
  <p>Btw i dont have to use regex for this, i just need to be able to check the strings somehow.</p>