Question

I need to make a method that checks if a given String only consists of lower- and uppercase letters, numbers, dots (.), hyphens (-) and underscores ( ).

public boolean isValidString(String name) {

}

I just don’t know how to get it started 🙁

Tx in advance

Answer 1

Use regular expressions:

String s = "Your_string-123.";
Pattern p = Pattern.compile("([a-zA-Z]|[0-9]|\\.|\\-|_)+");
Matcher m = p.matcher(s);
if (m.matches()) {
  System.out.println(true);
}