How to use `string.startsWith()` method ignoring the case in java?

How to use `string.startsWith()` method ignoring the case in java?

In Java, you can use the startsWith() method to check if a string starts with a specified prefix. If you want to perform this check while ignoring the case (i.e., performing a case-insensitive comparison), you can convert both the string and the prefix to lowercase (or uppercase) before calling startsWith(). Here's how you can do it:

public class Main { public static void main(String[] args) { String str = "Hello, world!"; String prefixToCheck = "heLLo"; // Prefix to check, ignoring case // Convert both the string and prefix to lowercase (or uppercase) and then check boolean startsWithIgnoreCase = str.toLowerCase().startsWith(prefixToCheck.toLowerCase()); if (startsWithIgnoreCase) { System.out.println("The string starts with the specified prefix (ignoring case)."); } else { System.out.println("The string does not start with the specified prefix (ignoring case)."); } } }

In this example, we convert both the str and prefixToCheck to lowercase using the toLowerCase() method before calling startsWith(). This ensures that the comparison is case-insensitive.

Alternatively, you can convert both to uppercase using toUpperCase() if you prefer to compare in uppercase:

boolean startsWithIgnoreCase = str.toUpperCase().startsWith(prefixToCheck.toUpperCase());

Keep in mind that this approach creates new strings with the lowercase or uppercase characters, so it might have a slight performance impact if used extensively on large strings.

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