title: Mysql throwing exception on Regex
body: <p>This works:</p>
  
  <pre><code>mysql&gt; SELECT '123456789' REGEXP '.{3}';#1
  
  mysql&gt; SELECT '123456789' REGEXP '.{10}';#2
  </code></pre>
  
  <p>but not this:</p>
  
  <pre><code>mysql&gt; SELECT * FROM mymodel WHERE some_text_field REGEXP '.{100}';#3
  </code></pre>
  
  <p>throwing exception:
  ERROR 1139 (42000): Got error 'invalid repetition count(s)' from regexp</p>