The flags() method of the Pattern class in Java is used to return the pattern’s match flags. The Match flags are a bit mask that may include CASE_INSENSITIVE, MULTILINE, DOTALL, UNICODE_CASE, CANON_EQ, UNIX_LINES, LITERAL, UNICODE_CHARACTER_CLASS and COMMENTS Flags.
Syntax:
public int flags()
Parameters: This method does not accepts any parameters.
Return Value: This method returns the pattern’s match flag.
Below programs illustrate the flags() method:
Program 1:
Java
// Java program to demonstrate// Pattern.flags() 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"; // compile the regex to create pattern // using compile() method Pattern pattern = Pattern.compile(REGEX, Pattern.CASE_INSENSITIVE); // find the flag of pattern int flag = pattern.flags(); System.out.println("Pattern's match flag = " + flag); }} |
Output:
Pattern's match flag = 2
Program 2:
Java
// Java program to demonstrate// Pattern.flags 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"; // compile the regex to create pattern // using compile() method Pattern pattern = Pattern.compile(REGEX, Pattern.MULTILINE); // find the flag of pattern int flag = pattern.flags(); System.out.println("Pattern's match flag = " + flag); }} |
Output:
Pattern's match flag = 8
References: https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#flags()