title: Cypress equalIgnoreCase
body: <p>I am using Cypress for testing but I can't find equalIgnoreCase in the documentation.</p>
  
  <p>here is my testing code and I want equalIgnoreCase in this case:</p>
  
  <pre><code>cy.get('#SelectedToAddress')
      .select('United Arab Emirates').should('have.value','AE')
  </code></pre>
  
  <p>I found in chai this for equalIgnoreCase</p>
  
  <pre><code>chai.assert.match("chrome", /Chrome/i); //should return true
  </code></pre>
  
  <p>But I don't how to use same with value property in Cypress</p>
  
  <p>Also, I found this chai plugin</p>
  
  <p><a href="http://www.chaijs.com/plugins/chai-string/" rel="nofollow noreferrer">http://www.chaijs.com/plugins/chai-string/</a></p>
  
  <p>But I don't know how could I add a chai plugin to Cypress</p>