如何在Java中检查字符串是否为ASCII

Question

In order to check whether the string of characters are ASCII or not. Which one of the below is better choice ?

1. java.nio.charset.Charset.forName("US-ASCII").newEncoder().canEncode("Desire character string to be checked") or
2. Convert the String to character array and use : org.apache.commons.lang.CharUtils.isAscii() method to check whether ASCII.

What are their differences, and which one is good performance wise. I know for the second option there is additional step of converting string to the character array first and then, need to check each character.

Answer 1

You can use regex as a quick shortcut.

String asciiText = "Hello";
System.out.println(asciiText.matches("\\A\\p{ASCII}*\\z"));

this will check only ASCII characters.

Regards.