Different custom validation in jquery validator

validation.js

    jQuery.validator.addMethod("alphanumeric", function(value, element) {    // allow only alpha numric validation
            return this.optional(element) || /^[a-zA-Z0-9]+$/.test(value);
    }); 
    
    jQuery.validator.addMethod("letterwithspaces", function(value, element) { // allow only latters with space validation
            return this.optional(element) || /^[a-zA-Z]+$/.test(value);
    }); 
        
    jQuery.validator.addMethod("imagetype", function(value, element) { // allow image validation
          return this.optional(element) || /^.*\.(jpg|png|jpeg|gif)$/i.test(value);
    }, "Please Select .jpg OR .png OR .gif Image");

    jQuery.validator.addMethod("filetype", function(value, element) { 
          return this.optional(element) || /^.*\.(doc|docx|pdf)$/i.test(value);
    }, "Please Select .doc OR .docx OR .pdf Image");
    
    jQuery.validator.addMethod('filesize', function(value, element, param) {
        // param = size (in bytes) 
        // element = element to validate (<input>)
        // value = value of the element (file name)
        return this.optional(element) || (element.files[0].size <= param) 
    });
    
    jQuery.validator.addMethod("lettersonly", function(value, element) { // allow only latters validation
        return this.optional(element) || /^[a-z ]+$/i.test(value);
    }, "Please enter alphanumeric letters only"); 

    jQuery.validator.addMethod("noSpace", function(value, element) {  // allow no space validation
        return value.indexOf(" ") < 0 && value != ""; 
    }, "Please enter valid account number");