fo"> (source:String, search:String) : Boolean</span><ul class="summary"><li>Determines if string contains search string.</li></ul></li><li class="sortli listnum6"><a href="#isEmpty">isEmpty</a><span class="typeInfo"> (source:String) : Boolean</span><ul class="summary"><li>Determines if string is blank or contains only tabs, linefeeds, carriage returns and spaces.</li></ul></li><li class="sortli listnum7"><a href="#isCreditCard">isCreditCard</a><span class="typeInfo"> (cardNumber:String) : Boolean</span><ul 