Matcher appendTail(StringBuilder) method in Java with Examples
Last Updated :
27 Nov, 2018
The appendTail(StringBuilder) method of Matcher Class behaves as a append-and-replace method. This method reads the input string and appends it to the given StringBuilder at the tail position.
Syntax:
public StringBuilder appendTail(StringBuilder builder)
Parameters: This method takes a parameter builder which is the StringBuilder that stores the target string.
Return Value: This method returns a StringBuilder with the target String replaced.
Below examples illustrate the Matcher.appendTail() method:
Example 1:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(Geeks)" ;
Pattern pattern = Pattern.compile(regex);
String stringToBeMatched
= "GeeksForGeeks Geeks for For Geeks Geek" ;
Matcher matcher
= pattern.matcher(stringToBeMatched);
System.out.println( "Before Replacement: "
+ stringToBeMatched);
String stringToBeReplaced = "GFG" ;
StringBuilder builder = new StringBuilder();
while (matcher.find()) {
matcher
.appendReplacement(builder,
stringToBeReplaced);
}
matcher.appendTail(builder);
System.out.println( "After Replacement: "
+ builder.toString());
}
}
|
Output:
Before Replacement: GeeksForGeeks Geeks for For Geeks Geek
After Replacement: GFGForGFG GFG for For GFG Geek
Example 2:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(FGF)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= " FGF GFG GFG FGF" ;
Matcher matcher
= pattern.matcher(stringToBeMatched);
System.out.println( "Before Replacement: "
+ stringToBeMatched);
String stringToBeReplaced = "Geeks" ;
StringBuilder builder = new StringBuilder();
while (matcher.find()) {
matcher
.appendReplacement(builder,
stringToBeReplaced);
}
matcher.appendTail(builder);
System.out.println( "After Replacement: "
+ builder.toString());
}
}
|
Output:
Before Replacement: FGF GFG GFG FGF
After Replacement: Geeks GFG GFG Geeks
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#appendTail-java.lang.StringBuilder-
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