Display a boolean method to determine if a given string contains a valid Missouri license number. Assume a valid license number is in the form of "LLDLDL" with each L representing a letter and each D representing a digit. Allow uppercase and lowercase letters. You may use regular expression related techniques, but only after you can solve the problem with the material we've covered.

Example valid license number strings: DJ3T3X, cc8D0P

Example invalid license number strings: D3J3TX (invalid character at specific index locations), PM5P (too short), BO1T4XJM (too long), U$8E4E (invalid character at specific index locations)

// Returns true if the string parameter contains a valid Missouri

// license number.

public static boolean isValid(String driverLicenseNum) {

/* ADD your work here */

}