This web content provides a list of regular expressions and their corresponding syntax and functionality. The author provides examples of various expressions such as concatenation, alternation, kleene star, grouping, exponentiation, repetition, and more. They highlight that certain features, such as anchors, zero-width assertions, back references, subgroup extraction, and searching or partial matching, are not supported. The author also mentions that the expressions are case-sensitive unless specified otherwise. Overall, the content serves as a guide to using regular expressions effectively. It is worth noting that the website mentioned in the content provides additional information on the topic.
http://phylactery.org/antimirov/