您可以使用以下任一正则表达式匹配给定字符串中的数字-
“\\d+” Or, "([0-9]+)"
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class ExtractingDigits { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter sample text: "); String data = sc.nextLine(); //正则表达式以匹配字符串中的数字 String regex = "\\d+"; //创建一个模式对象 Pattern pattern = Pattern.compile(regex); //创建一个Matcher对象 Matcher matcher = pattern.matcher(data); System.out.println("Digits in the given string are: "); while(matcher.find()) { System.out.print(matcher.group()+" "); } } }
输出结果
Enter sample text: this is a sample 23 text 46 with 11223 numbers in it Digits in the given string are: 23 46 11223
import java.util.regex.Matcher; import java.util.regex.Pattern; public class Just { public static void main(String[] args) { String data = "abc12def334hjdsk7438dbds3y388"; //正则表达式到数字 String regex = "([0-9]+)"; //创建一个模式对象 Pattern pattern = Pattern.compile(regex); //创建一个Matcher对象 Matcher matcher = pattern.matcher(data); System.out.println("Digits in the given string are: "); while(matcher.find()) { System.out.print(matcher.group()+" "); } } }
输出结果
Digits in the given string are: 12 334 7438 3 388