The usePattern() method of Matcher Class is used to get the pattern to be matched by this matcher. Syntax:
public Matcher usePattern(Pattern newPattern)
Parameters: This method takes a parameter newPattern which is the new pattern to be set. Return Value: This method returns a Matcher with the new Pattern. Exception: This method throws IllegalArgumentException if newPattern is null. Below examples illustrate the Matcher.usePattern() method: Example 1:
Java
// Java code to illustrate usePattern() method import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "Geeks";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GeeksForGeeks";
// Create a matcher for the input String
Matcher matcher
= pattern
.matcher(stringToBeMatched);
// Get the new Pattern
String newPattern = "GFG";
// Get the Pattern using pattern method
System.out.println("Old Pattern: "
+ matcher.pattern());
// Set the newPattern using usePattern() method
matcher = matcher
.usePattern(
Pattern
.compile(newPattern));
// Get the Pattern
// using pattern method
System.out.println("New Pattern: "
+ matcher.pattern());
}
} |
Output:
Old Pattern: Geeks New Pattern: GFG
Example 2:
Java
// Java code to illustrate usePattern() method import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "GFG";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG";
// Create a matcher for the input String
Matcher matcher
= pattern
n.matcher(stringToBeMatched);
// Get the new Pattern
String newPattern = "Geeks";
// Get the Pattern using pattern method
System.out.println("Old Pattern: "
+ matcher.pattern());
// Set the newPattern using usePattern() method
matcher = matcher
.usePattern(
Pattern
.compile(newPattern));
// Get the Pattern
// using pattern method
System.out.println("New Pattern: "
+ matcher.pattern());
}
} |
Output:
Old Pattern: GFG New Pattern: Geeks
Reference: Oracle Doc