Regular expressions are used to match patterns found in text or strings. Regex can be used for testing and finding patterns as desired against text or web content. Regex contains various ways to define patterns and special notations, such as escape codes to apply some predefined rules. For more information on Regex, please refer to the Further reading section.
There are various cases where Regex can be quite effective and quick for obtaining the desired results. Regex can be applied to content (text or web sources) alone and can be used to target specific information patterns that aren't easily extractable while using XPath, CSS selectors, BS4, PyQuery, and so on.
Sometimes, cases may arise that will demand Regex and XPath or CSS selectors to be used together in order to obtain the desired output. This output can then be tested using Regex...