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Java String matches() usage and example

Java String (String) Methods

The Java String Match() method checks if the string matches the given regular expression.

The syntax of the string matches() method is:

string.matches(String regex)

Here, string is an object of the String class.

match() parameter

  • regex - Regular expression

valueOf() return value

  • If the regular expression matches the string, thenReturns true

  • If the regular expression does not match the string, thenReturns false

Example1：Java match()

class Main {
　　public static void main(String[] args) {
　　　　//Regular expression pattern
　　　　//A five-letter string that starts with 'a' and ends 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 regular expression that represents a string starting with a and ending with s5a string with only letters s.

Example2：Check numbers

//Check if a string contains only numbers
class Main {
　　public static void main(String[] args) {
　　　　//Pattern for searching 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 regular expression that represents numbers only.

Java String (String) Methods

Java Method OverloadingJava String Methods Comprehensive