String contains check: How to check if one string is contained within another

Checking if one string is contained within another is a common task in programming. Fortunately, most programming languages provide a built-in method or function for this task.

String contains check in Java

In Java, the String class provides the contains() method to check if a string is contained within another string. The method returns a boolean value, true if the string contains the specified sequence of characters, and false otherwise.

String str1 = "Hello, World!";
String str2 = "World";

if (str1.contains(str2)) {
    System.out.println("str1 contains str2");
} else {
    System.out.println("str1 does not contain str2");
}

String contains check in Python

In Python, the in keyword can be used to check if a string is contained within another string. The keyword returns a boolean value, True if the string contains the specified sequence of characters, and False otherwise.

str1 = "Hello, World!"
str2 = "World"

if str2 in str1:
    print("str1 contains str2")
else:
    print("str1 does not contain str2")

Conclusion

Checking if one string is contained within another is a simple task, and most programming languages provide a built-in method or function for this purpose. Java provides the contains() method and Python provides the in keyword for this task.