How to get last/first n char from a String using Apex in Salesforce

.right() is used to get last n char from a String using Apex.

.left() is used to get first n char from a String using Apex.

Example:

String str = 'SalesforceCloudwaale';

String result = str.right(10); //returns Cloudwaale

String str = 'SalesforceCloudwaale';

String result = str.left(10); //returns Salesforce