Java String matches() Method
What is strings in Java?
A string is a sequence of characters that is stored as a char array and is represented by the String class. Strings are commonly used to store and display text such as names, addresses, and other kinds of information. They are also used to store and manipulate data read from external sources, such as text files or user input.
- Strings are also widely used in Java for formatting and parsing data. For example, you can use the String.format method to format numbers and dates as strings, or use the parseInt and parseDouble methods to convert strings to numbers.
To know more about String Class in java read the complete article.
String matches() method in Java.
The Java String matches() method is a static method of the java.lang.String class that is used to check if a given string matches a specified regular expression. This method returns a boolean value indicating whether the string matches the regular expression.
The String.prototype.startsWith() method determines whether a string begins with the characters of a specified string. This method returns a boolean value indicating whether the original string starts with the characters of the specified string.
The java.lang.String class provides a lot of built-in methods that are used to manipulate string in Java.These methods help us to perform operations on String objects such as trimming, concatenating, converting, comparing, replacing strings etc.
Syntax:
public boolean matches(String regex)
Parameters:
regex - the regular expression to which this string is to be matched
Let’s look at a string-related Java program where the Java String startsWith() Method is used to perform an operation on the given string.
Example: Java String Matches Method
public class Main {
public static void main(String args[]) {
String Str = new String("PrepInsta is a learning Platform");
System.out.print("Return Value :" );
System.out.println(Str.matches("(.*)Platform(.*)"));
System.out.print("Return Value :" );
System.out.println(Str.matches("Platform"));
System.out.print("Return Value :" );
System.out.println(Str.matches("PrepInsta(.*)"));
}
}
Output
true false false
Example 2 : Java String Matches Method
public class Main {
public static void main(String args[]) {
String str = "Hello, World!";
System.out.println(str.matches("Hello, World!"));
System.out.println(str.matches("^H.*d!$"));
System.out.println(str.matches("^h.*d!$"));
}
}Output
true true false
Example 3: Java Spilt Method Using Regex and Length
public class Main {
public static void main(String[] args) {
String str = "Hello, World!";
// Check if the string matches a specific string
System.out.println(str.matches("Hello, World!")); // true
// Check if the string matches a regular expression
System.out.println(str.matches("^H.*d!$")); // true
System.out.println(str.matches("^h.*d!$")); // false
// Check if the string is a valid email address
String emailRegex = "^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";
String email = "john@example.com";
System.out.println(email.matches(emailRegex)); // true
// Check if the string is a valid phone number
String phoneRegex = "^\\(?([0-9]{3})\\)?[-.\\s]?([0-9]{3})[-.\\s]?([0-9]{4})$";
String phone = "123-456-7890";
System.out.println(phone.matches(phoneRegex)); // true
}
}
Output
true true false true true
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