Regular Expression related: first character alphabet second onwards alphanumeric+some special characters

Question

I have one question related with regular expression. In my case, I have to make sure that first letter is alphabet, second onwards it can be any alphanumeric + some special char

Answer 1

I think the simplest answer is to pick and match only the first character with regex.

String str = "s12353467457458";
if ((""+str.charAt(0)).matches("^[a-zA-Z]")){
    System.out.println("Valid");
}