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Java String matches()

The Java String matches() method checks whether the string matches the given regular expression or not.

The syntax of the string matches() method is:

string.matches(String regex)

Here, string is an object of the String class.


matches() Parameters

The matches() method takes a single parameter.

  • regex - a regular expression

valueOf() Return Value

  • returns true if the regex matches the string
  • returns false if the regex doesn't match the string

Example 1: Java matches()

class Main {
  public static void main(String[] args) {

    // a regex pattern for
    // five letter string that starts with 'a' and end with 's'
    String regex = "^a...s$";

    System.out.println("abs".matches(regex)); // false
    System.out.println("alias".matches(regex)); // true
    System.out.println("an abacus".matches(regex)); // false
    System.out.println("abyss".matches(regex)); // true
  }
}

Here, "^a...s$" is a regex, which means 5 letter string that starts with a and ends with s.


Example 2: Check for Numbers

// check whether a string contains only numbers

class Main {
  public static void main(String[] args) {

    // a search pattern for only numbers
    String regex = "^[0-9]+$";

    System.out.println("123a".matches(regex)); // false
    System.out.println("98416".matches(regex)); // true
    System.out.println("98 41".matches(regex)); // false
  }
}

Here, "^[0-9]+$" is a regex, which means only digits.

To learn more about regex, visit Java Regex.