RegexpTree represents regular expression.
It can be converted to Regexp.
RegexpTree.str(string)-
returns an instance of RegexpTree which only matches string
RegexpTree.alt(*regexp_trees)-
returns an instance of RegexpTree which is alternation of regexp_trees.
RegexpTree.seq(*regexp_trees)-
returns an instance of RegexpTree which is concatination of regexp_trees.
RegexpTree.rep(regexp_tree, min=0, max=nil, greedy=true)-
returns an instance of RegexpTree which is reptation of regexp_tree.
RegexpTree.charclass(natset)-
returns an instance of RegexpTree which matches characters in natset.
regexp(anchored=false)-
convert to Regexp.
If anchored is true, the Regexp is anchored by \A and \z.
to_s-
convert to String.
empty_set?-
returns true iff self never matches.
empty_sequence?-
returns true iff self only matches empty string.
self | other-
returns alternation of self and other.
self + other-
returns concatination of self and other.
self * n-
returns n times repetation of self.
rep(min=0, max=nil, greedy=true)-
returns min to max times repetation of self.