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Early origin

The "ancestor" of canonical expressions can be traced back to early studies of how the human nervous system works. Two neurophysiologists Warren McCulloch and Walter Pitts have developed a mathematical way to describe these neural networks.

In 1956, an American mathematician named Stephen Kleene, based on the early work of McCulloch and Pitts, published a paper entitled "representation of Neural Network events", which introduced the concept of regular expression. Regular expressions are used to describe what he calls "algebra of regular sets", so the term "regular expressions" is adopted.

Subsequently, it was found that this work could be applied to some early research on computational search algorithms using Ken Thompson, the main inventor of Unix. The first utility for regular expressions is the qed editor in Unix.

As they say, the rest is well-known history. Regular expressions have been an important part of text-based editors and search tools since then.

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