/usr/share/doc/alex/examples/examples.x is in alex 3.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | "example_rexps":-
<a_star> ::= $ | a+ -- = a*, zero or more as
<a_plus> ::= aa* -- = a+, one or more as
<a_quest> ::= $ | a -- = a?, zero or one as
<a_3> ::= a{3} -- = aaa, three as
<a_3_5> ::= a{3,5} -- = a{3}a?a?
<a_3_> ::= a{3,} -- = a{3}a*
"example_sets":-
<lls> ::= a-z -- little letters
<not_lls> ::= ~a-z -- anything but little letters
<ls_ds> ::= [a-zA-Z0-9] -- letters and digits
<sym> ::= `!@@#$' -- the symbols !, @@, # and $
<sym_q_nl> ::= [`!#@@$'^'^n] -- the above symbols with ' and newline
<quotable> ::= ^p#^' -- any graphic character except '
<del> ::= ^127 -- ASCII DEL
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