TRE

If you're looking for a regexp matching library that is lightweight, efficient, and open source, you should consider trying out TRE. Not only is this library free to use, but it also comes with a range of exciting features that can help you get the job done quickly and easily.

Of these features, one of the most exciting is the capability to perform approximate (or fuzzy) matching. This means that TRE can identify and match regular expressions even if they are only partially correct or spelled incorrectly.

One of the standout benefits of TRE is its matching algorithm, which is built to be robust and efficient. Specifically, the algorithm is designed to work with POSIX-compliant regexp syntax and uses linear worst-case time for the length of the text being searched. Additionally, it uses quadratic worst-case time in the length of the regular expression used. In other words, the time complexity of the algorithm is O(M2N), where M is the length of the regular expression, and N is the length of the text. And while the used space is also quadratic on the length of the regex, this behavior is only likely to occur in rare, pathological cases.

Overall, TRE is an excellent choice for anyone looking for a reliable, open source regexp matching library with advanced features and high performance. Whether you're a developer or a researcher, this tool is sure to help you accomplish your goals quicker and more easily than ever before.