Pattern pattern() method in Java with Examples
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The pattern() method of the Pattern class in Java is used to get the regular expression which is compiled to create this pattern. We use a regular expression to create the pattern and this method used to get the same source expression.
Syntax:
public String pattern()
Parameters: This method does not accepts anything as parameter.
Return Value: This method returns the pattern’s source regular expression.
Below programs illustrate the pattern() method:
Program 1:
Java
// Java program to demonstrate// Pattern.pattern() methodimport java.util.regex.*;public class GFG { public static void main(String[] args) { // create a REGEX String String REGEX = "(.*)(for)(.*)?"; // create the string // in which you want to search String actualString = "code of Machine"; // create pattern Pattern pattern1 = Pattern.compile(REGEX); // find the regular expression of pattern String RegularExpression = pattern1.pattern(); System.out.println("Pattern's RegularExpression = " + RegularExpression); }} |
Output:
Pattern's RegularExpression = (.*)(for)(.*)?
Program 2:
Java
// Java program to demonstrate// Pattern.pattern methodimport java.util.regex.*;public class GFG { public static void main(String[] args) { // create a REGEX String String REGEX = "(.*)(ee)(.*)?"; // create the string // in which you want to search String actualString = "geeks"; // create pattern Pattern pattern1 = Pattern.compile(REGEX); // find the regular expression of pattern String RegularExpression = pattern1.pattern(); System.out.println("Pattern's RegularExpression = " + RegularExpression); }} |
Output:
Pattern's RegularExpression = (.*)(ee)(.*)?
Program 3:
Java
import java.io.*;import java.util.regex.Matcher;import java.util.regex.Pattern;public class GFG { public static void main(String[] args) { String input1 = "The quick brown fox jumps over the lazy dog"; String input2 = "The quick red fox jumps over the lazy dog"; String regex = "(?i)the"; Pattern pattern = Pattern.compile(regex); Matcher matcher1 = pattern.matcher(input1); Matcher matcher2 = pattern.matcher(input2); while (matcher1.find()) { System.out.println("Match 1: " + matcher1.group()); } while (matcher2.find()) { System.out.println("Match 2: " + matcher2.group()); } }} |
Output
Match 1: The Match 1: the Match 2: The Match 2: the
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