title: R gsub multiple conditions
body: <p>I am trying to use gsub on a set of strings that might all vary in the wording slightly;</p>
  
  <pre><code>I went to the store last night
  I went to the park yesterday
  I went to starbucks this morning
  </code></pre>
  
  <p>I need to use gsub to replace the 'I went to...', but sometimes it will have a 'the' and sometimes it won't</p>
  
  <p>Something like this, but the following won't work properly</p>
  
  <pre><code>gsub('i went to [the|a-z]','REPLACED',string)
  
  REPLACED last night
  REPLACED yesterday
  REPLACED this morning
  </code></pre>