title: Ace editor snippet format for RegEx based triggers
body: <p>I'm using an array of snippets with following format</p>
  
  <pre><code>{
    name: 'response',
    trigger: 'resp|rp',
    path: ['paths', '.', '.', '.'],
    content: [
      '${1:code}:',
      '  description: ${2}',
      '  schema: ${3}',
      '${4}'
    ].join('\n')
  },
  </code></pre>
  
  <p>How can I use a RegEx for the trigger? I tried <code>regex</code> key with no luck.</p>