From: Josh Cheek <josh.cheek@...>
Date: 2010-04-14T23:58:56+09:00
Subject: Re: Method to groom a string to floating point representation

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On Wed, Apr 14, 2010 at 8:33 AM, Alex DeCaria <alex.decaria@millersville.edu
> wrote:

> Josh Cheek wrote:
> > This is what I have so far, please check and correct any tests that
> > should
> > be different
>
> Josh,
>
> Your code works great!  I knew there had to be a more elegant way to do
> this rather than my brute force method.
>
> The only test it didn't seem to work on was eliminating extra + or -
> signs, such as '+45-2+8' => '+4528', but now that I see what you are
> doing I can probably figure out how to do that.  I definitely need to
> learn more about regular expressions!
>
> Thanks for your time and effort.
>
> --Alex
> --
> Posted via http://www.ruby-forum.com/.
>
>
It wasn't done, because I wanted clarification on the tests first.

Anyway, this one passes all tests.

def clean_string(str)
  str =~ /\A([-+]?)([eE]?)([^eE.]*\.?)([^eE]*)((?:[eE][+-]?)?)([^Z]*)\Z/
  posneg , misplaced_e , before_dec , after_dec , e , exponent = $1 , $2 ,
$3 , $4 , $5 , $6
  posneg + before_dec.gsub(/[^0-9.]/,'') + after_dec.gsub(/[^0-9]/,'') + e +
exponent.gsub(/[^0-9]/,'')
end

require 'test/unit'
class TestCleanString < Test::Unit::TestCase
  def test_delete_chars
    assert_equal '-24.5e45' , clean_string('-24.5fge4x5')
  end
  def test_delete_extra_decimal
    assert_equal '2.45' , clean_string('2.4.5')
    assert_equal '2.45' , clean_string('2..45')
    assert_equal '2.45' , clean_string('2...45')
  end
  def test_delete_extra_decimal_in_exponent
    assert_equal '245e76' , clean_string('245e7.6')
  end
  def test_delete_extra_or_misplaced_pos_and_neg_signs
    assert_equal '+4568e+45' , clean_string('+45-68+e+45-')
  end
  def test_delete_extra_or_misplaced_e_or_E
    assert_equal '4.67e67'  , clean_string('4.67e6e-7')
    assert_equal '+4.67e-7' , clean_string('+e4.67e-7')
  end
end

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