title: regex multiple pattern with singular replacement
body: <p>I am trying to replace both "st." and "ste." with "st".  Seems like the following should work but it does not:</p>
  
  <pre><code>require("stringr")
  county &lt;- c("st. landry", "ste. geneveve", "st. louis")
  str_replace_all(county, c("st\\.", "ste\\."), "st")
  </code></pre>