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How to extract numbers from a string using regular expressions?
You can match numbers in the given string using either of the following regular expressions −
“\d+” Or, "([0-9]+)"
Example 1
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();
//Regular expression to match digits in a string
String regex = "\d+";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(data);
System.out.println("Digits in the given string are: ");
while(matcher.find()) {
System.out.print(matcher.group()+" ");
}
}
}Output
Enter sample text: this is a sample 23 text 46 with 11223 numbers in it Digits in the given string are: 23 46 11223
Example 2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Just {
public static void main(String[] args) {
String data = "abc12def334hjdsk7438dbds3y388";
//Regular expression to digits
String regex = "([0-9]+)";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Creating a Matcher object
Matcher matcher = pattern.matcher(data);
System.out.println("Digits in the given string are: ");
while(matcher.find()) {
System.out.print(matcher.group()+" ");
}
}
}Output
Digits in the given string are: 12 334 7438 3 388
Updated on: 21-Nov-2019
13K+ Views
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