How can I use the Apex string replace method for replacing all occurrences in the Salesforce apex code?

n the context of Salesforce, here is how you can use the Apex replace method for replacing all occurrence of a specific substring within a given string with another in Salesforce apex code:-

This example would include a method which would task parameters for the original string, the substring to replace, and the replacement substring:-

Public class StringManipulationExample {

    // Method to replace all occurrences of a substring in a string

    Public static String replaceSubstring(String originalString, String substringToReplace, String replacementString) {

        // Check if the originalString and substringToReplace are not null or empty

        If (String.isNotBlank(originalString) && String.isNotBlank(substringToReplace)) {

            // Replace all occurrences of substringToReplace with replacementString

            Return originalString.replace(substringToReplace, replacementString);

        } else {

            // Handle null or empty input strings

            If (String.isBlank(originalString)) {

                System.debug(‘Error: Original string is null or empty.’);

            }

            If (String.isBlank(substringToReplace)) {

                System.debug(‘Error: Substring to replace is null or empty.’);

            }

            // Return originalString if either originalString or substringToReplace is null or empty

            Return originalString;

        }

    }

    // Example usage in a test method

    Public static void testReplaceMethod() {

        // Original string

        String originalString = ‘This is a sample string with some sample text.’;

        // Substring to replace

        String substringToReplace = ‘sample’;

        // Replacement string

        String replacementString = ‘example’;

        // Call the replaceSubstring method to replace all occurrences

        String modifiedString = replaceSubstring(originalString, substringToReplace, replacementString);

        // Print the modified string to debug logs

        System.debug(‘Modified String: ‘ + modifiedString); 

        // Output: ‘This is a example string with some example text.’

    }

}