Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Regular Expressions, au point   We introduce a new technique for constructing a finite state deterministic
automaton from a regular expression, based on the idea of marking a suitable
set of positions inside the expression, intuitively representing the possible
points reached after the processing of an initial prefix of the input string.
Pointed regular expressions join the elegance and the symbolic appealingness of
Brzozowski's derivatives, with the effectiveness of McNaughton and Yamada's
labelling technique, essentially combining the best of the two approaches.

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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph