I have recently came across a problem where I need to solve the subset sum problem. In this problem we have an array of numbers and we need to find the elements from the array whose sum matches a given number. You can find more details of the subset sum problem in the Wikipedia page here.
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Regular Expression (regex) is used to find a pattern in strings. It is widely popular in the programming languages and can also be used to find something in the text editors. Here, irrespective of the programming language, we will try to learn the basics of how to build a regex to get you started quickly.
Let’s start by different ways of matching string.