Write a Java program to check whether a string contains only a certain set of characters (in this case a-z, A-Z and 0-9).
JAVA Advanced System Development. Write a regular expression that will match a string that starts with a series of letters. The letters must be followed by a period. After the period, there must be a series of digits. The string “kjisl.22” would match. The string “f4.12b” would not. Use the following string to test your … Read more