With this example we are going to demonstrate how to use Matcher.appendReplacement(StringBuffer sb, String replacement) API method to append to a StringBuffer the result of a Matcher. In short, to use a StringBuffer to append a Matcher’s result you should:
- Compile a given String regular expression to a Pattern, using
compile(string regex)API method of Pattern. - Use
matcher(CharSequence input)API method of Pattern to create a Matcher that will match the given String input against this pattern. - Create a new StringBuffer.
- Find the next subsequence of the input sequence that matches the pattern, with
find()API method of Matcher and append it to the StringBuffer, implementing a non-terminal append-and-replace step, usingappendReplacement(StringBuffer sb, String replacement)API method of Matcher.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class AppendReplacement {
public static void main(String args[]) {
Pattern pattern = Pattern.compile("(another) (test)");
StringBuffer sb = new StringBuffer();
String candidateString = "This is another test.";
String replacement = "$1 AAA $2";
Matcher m = pattern.matcher(candidateString);
m.find();
m.appendReplacement(sb, replacement);
String msg = sb.toString();
System.out.println(msg);
}
}
Output:
This is another AAA test
This was an example of how to Matcher.appendReplacement(StringBuffer sb, String replacement) API method in Java.
