Whether you’re coding, using a search engine, searching and replacing text in a text editor, or using the command-line utilities grep, sed, and awk in Linux, you’re using regular expressions (also known as “regex” or “regexp”). Yes, they’re everywhere. A regular expression is a sequence of characters used to describe a text pattern. Working with regular expressions is rarely described as fun, but they are useful for various problems while coding a feature, such as...

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