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In page Regular expression:
"Other features not found in describing regular languages include assertions. These include the ubiquitous
^and$, used since at least 1970,[1] as well as some more sophisticated extensions like lookaround that appeared in 1994.[2] Lookarounds define the surrounding of a match and do not spill into the match itself, a feature only relevant for the use case of string searching.[citation needed] Some of them can be simulated in a regular language by treating the surroundings as a part of the language as well.[3]
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