Java Matcher appendReplacement() method

This method is used to implement append-and-replace step. First, It replaces compiled character or word with given input sequence and then it appends the given replacement string to the string buffer.

Syntax

Parameter

strbuff - The target string buffer

replcmnt - The replacement string

Returns

This matcher

Throws

IllegalStateException - If no match has yet been attempted, or if the previous match operation failed

IllegalArgumentException - If the replacement string refers to a named-capturing group that does not exist in the pattern

IndexOutOfBoundsException - If the replacement string refers to a capturing group that does not exist in the pattern

Example 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherAppendReplacementExample1 {
	public static void main(String[] args) {
	//pattern/expression to be matched
	Pattern p = Pattern.compile("dog",Pattern.CASE_INSENSITIVE);
	//Regular expression
	Matcher m = p.matcher("'Let the dog come out of the bag'.To disclose a secret(Dog)");
	 // Creating the target string buffer
	StringBuffer sb = new StringBuffer();
	while (m.find()) {
m.appendReplacement(sb, "cat");//calling method System.out.println(sb.toString());
            }
       }
}

Test it Now

Output:

'Let the cat
'Let the cat come out of the bag'.To disclose a secret(cat

Example 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MatcherAppendReplacementExample2 {

	public static void main(String[] args) {
	//pattern/expression to be matched
	Pattern p = Pattern.compile("dog",Pattern.CASE_INSENSITIVE);
	//Regular expression
	Matcher m = p.matcher("'Let the dog come out of the bag'.To disclose a secret(Dog)**");
	// Creating the target string buffer
	StringBuffer sb = new StringBuffer();
	while (m.find()) {
m.appendReplacement(sb, "cat");//calling method System.out.println(sb.toString());
		}
			 m.appendTail(sb);
			 System.out.println(sb.toString());
		}
}

Test it Now

Output:

'Let the cat come out of the bag'.To disclose a secret(cat)**

Example 3

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MatcherAppendReplacementExample3 {

	public static void main(String[] args) {

		//pattern/expression to be matched
				Pattern p = Pattern.compile("[1-9]+");
				//Regular expression
				 Matcher m = p.matcher("131Hello232word7876");
				 // Creating the target string buffer
				 StringBuffer sb = new StringBuffer();
				 while (m.find()) {
				     m.appendReplacement(sb, "-");//calling method 
				     System.out.println("Start :  "+m.start()+" End : "+m.end());
				 }
				 m.appendTail(sb);
				 System.out.println(sb.toString());
			}
		}

Test it Now

Output:

Start :  0 End : 3
Start :  8 End : 11
Start :  15 End : 19
-Hello-word-

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