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Py-libtre

Jul 20, 2023

Python interface for the tre regular expressions library

Libtre is an attempt to create a lightweight, robust, and efficient fully POSIX compliant regexp matching library. There is still some work left, but the results so far are promising.

At the core of Libtre is a new algorithm for regular expression matching with submatch addressing. The algorithm uses linear worst-case time in the length of the text being searched, and quadratic worst-case time in the length of the used regular expression. In other words, the time complexity of the algorithm is OM2N, where M is the length of the regular expression and N is the length of the text. The used space is also quadratic on the length of the regex, but does not depend on the searched string. This quadratic behaviour occurs only on pathological cases which are probably very rare in practice.

WWW http//laurikari.net/tre/

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