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Replacing all the matched contents Java regular expressions
Once you compile the required regular expression and retrieved the matcher object by passing the input string as a parameter to the matcher() method.
You can replace all the matched parts of the input string with another str4ing using the replaceAll() method of the Matcher class.
This method accepts a string (replacement string) and replaces all the matches in the input string with it and returns the result.
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ReplaceAll{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input text: ");
String input = sc.nextLine();
String regex = "\t+";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
int count = 0;
while (matcher.find()) {
count++;
}
System.out.println("No.of matches: "+count);
String result = matcher.replaceAll(" ");
System.out.println("Result: "+result);
}
}Output
Enter input text: sample text with tab spaces No.of matches: 4 Result: sample text with tab spaces
In the same way you can replace the first match using the replaceFirst() method of the Matcher class.
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ReplaceAll{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input text: ");
String input = sc.nextLine();
String regex = "\d";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
int count = 0;
while (matcher.find()) {
count++;
}
System.out.println("No.of matches: "+count);
String result = matcher.replaceFirst("#");
System.out.println("Result: "+result);
}
}Output
Enter input text: test data 1 2 3 No.of matches: 3 Result: test data # 2 3
Updated on: 13-Jan-2020
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