rsa-matcher

• Jan Vašák, xvasak01@vutbr.cz, 2024

This is a prototype of a regex matcher based on register set automata [1].

Usage

To run use: python rsa-matcher [-h] [-d] [-f FILE] pattern

• pattern regex to be matched to input data
• -h print help and exit
• -d don't determinise ahead of time (determinise the regex on for each input line)
• -f FILE specify file to read from

The program then reads lines from stdin (or FILE if specified) and prints out every line that matches the pattern.

As rsaregex has methods for drawing the automata using graphviz, it requires installation of graphviz (sudo apt-get install graphviz on Linux) and its Python library (pip install graphviz).

rsaregex package

Package implementing RsA-based regex matching and also a representation of register (set) automata as the classes RsA, DRsA, and NRA. Also provides the function draw_automaton to draw a specified automaton into a pdf file using graphviz.

For regex matching use either

• drsa = rsaregex.create_rsa(pattern) to create the DRsA and then use result = drsa.run_word(input) to match the input to the pattern, or
• result = rsaregex.match(pattern, input) to do the above in one operation (not recommended for repeated matching). Beware that result might be -1 if the pattern cannot be determinised.

References

[1] Gulčíková, S. and Lengál, O. Register Set Automata (Technical Report). arXiv. 2022. DOI: 10.48550/ARXIV.2205.12114. Available at: https://arxiv.org/abs/2205.12114