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class NumberParser
@@number_regexps = {
:to_i => /([+-]?[0-9]+)/,
:to_f => /([+-]?([0-9]*\.)?[0-9]+(e[+-]?[0-9]+)?)/i,
:oct => /([+-]?[0-7]+)/,
:hex => /\b([+-]?(0x)?[0-9a-f]+)\b/i
}
def NumberParser.re(parsing_method=:to_i)
re = @@number_regexps[parsing_method]
raise ArgumentError, "No regexp for #{parsing_method.inspect}!" unless re
return re
end
def extract(s, parsing_method=:to_i)
numbers = []
s.scan(NumberParser.re(parsing_method)) do |match|
numbers << match[0].send(parsing_method)
end
numbers
end
end
p = NumberParser.new
pw = "104 and 391."
NumberParser.re(:to_i).match(pw).captures
p.extract(pw, :to_i)
p.extract('$60.50', :to_f)
p.extract('AAA', :hex)
p.extract('017.', :oct)
p.extract('From 0 to 10e60 AA -2.4 s')
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