According to Wikipedia, a regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations.

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Simplifying backreferences

This is a theoretical example for simplicity's sake. I use flat values in the regex to make it easily legible for almost anyone, since lots of {,(,[,\'s all jammed together can be a headache to read. ...