Regular expression or Regex for short is a way to search pattern in a big text of data. RegEx is also used for data validation like secure password, correct email format but it's usage can be extended. It can also be used for data scrapping but be careful about it and watch the end part of video for caution instructions.
Android and iOS apps are very strict about usage of such technique. You can also take your pentesing game to next level with regex.
Watch video for more on RegEx

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