title: How to check whether a string contains a substring in Mule?
body: <p>I want to use the Assert Equals component to find if a string exists in my payload. I give an example:</p>
  
  <p>Txt|Name=ST CLAUD|Country=SPAIN|Txtld=45</p>
  
  <p>I want to search if the payload contains the string "SPAIN" Is there a mule expression MEL to do that?</p>
  
  <p>Thank you in advance</p>