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Re: How do I do this search and replace? [message #172339 is a reply to message #172335]

Sun, 13 February 2011 13:51

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 2/13/2011 8:33 AM, The Natural Philosopher wrote:
> Doug Miller wrote:
>> In article <vscel6le4f6810hekfooookik3ircj3ue3(at)4ax(dot)com>,
>> evan(at)theobvious(dot)espphotography(dot)com(dot)invalid wrote:
>>> On Sat, 12 Feb 2011 20:23:54 -0500, Jerry Stuckle
>>> <jstucklex(at)attglobal(dot)net> wrote:
>>>
>>>> Sorry, Evan, you've just proven you are ignorant and a troll. You
>>>> aren't even intelligent enough to understand when he's right.
>>> What part of "Well, it didn't work for me, so if it works for someone
>>> else, more power to them." did you not understand?
>>
>> If it didn't work for you, clearly you implemented it wrong. Or, as
>> seems more likely, you didn't actually try it at all.
>>
>> Here's a formal proof that Richard's method is correct:
>>
>> Let A be the string <a>\r\n<b>, and B the string <c>\n<d>,where <a>,
>> <b>, <c>, and <d> are any arbitrary strings not containing "\n". The
>> first operation, replace all "\r\n" with "\n", changes A to <a>\n<b>
>> and leaves B untouched. The second operation, replace all "\n" with
>> "\r\n", changes A to <a>\r\n<b>, and B to <c>\r\n<d>, which is the
>> specified result: change \n to \r\n except when \n is immediately
>> preceded with \r.
>>
>> If you would dispute that proof, demonstrate the flaw in it, or post a
>> counterexample. Otherwise, you owe Richard an apology.
>> Time to man up, Evan.
>>
> Indeed. simple problems like this, it's easy to construct state machines
> for, and examine every possible combination, and produce totally
> reliable bug free code. Sadly such examples are few and far between.
>
>
> As someone else pointed out tho, what about a single '\r'?
>
> Whether you implement the sate machine in a regexp, simple replacement
> with string functions, or write a straight copying loop that examines
> characters and pairs of characters and makes instant decisions on the
> basis of comparison, is down to taste.
>
> In terms of CPU time, its a one pass loop if you do teh latter, and ver
> efficient.
>
> Regexps are the least efficient and the most impenetrable, but they make
> people feel smart, so they have their place. They hark back to the days
> of teletypes and paper tapes, when code terseness was overwhelmingly
> important, and all coding was done and checked on a bit of paper with a
> pencil, before being laboriously entered onto The Computer. There being
> only one, and far too few teletypes or time allowed on it for more than
> one crack.
>

Why do you need a state machine? That's like pounding a nail with a
sledgehammer.

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		How do I do this search and replace? By: laredotornado@zipmail on Sat, 12 February 2011 21:15
		Re: How do I do this search and replace? By: richard on Sat, 12 February 2011 21:20
		Re: How do I do this search and replace? By: Evan Platt on Sat, 12 February 2011 22:09
		Re: How do I do this search and replace? By: sheldonlg on Sat, 12 February 2011 23:59
		Re: How do I do this search and replace? By: Tim Streater on Sun, 13 February 2011 00:08
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 00:24
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 00:40
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 01:03
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 00:58
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 00:57
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:14
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 01:23
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:29
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 01:38
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:54
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:00
		Re: How do I do this search and replace? By: spambait on Sun, 13 February 2011 13:16
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 13:33
		Re: How do I do this search and replace? By: me on Sun, 13 February 2011 13:45
		Re: How do I do this search and replace? By: sheldonlg on Sun, 13 February 2011 13:48
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:51
		Re: How do I do this search and replace? By: spambait on Mon, 14 February 2011 01:58
		Re: How do I do this search and replace? By: Denis McMahon on Mon, 14 February 2011 02:25
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:51
		Re: How do I do this search and replace? By: sheldonlg on Mon, 14 February 2011 12:50
		Re: How do I do this search and replace? By: Jerry Stuckle on Mon, 14 February 2011 12:58
		Re: How do I do this search and replace? By: Denis McMahon on Mon, 14 February 2011 15:34
		Re: How do I do this search and replace? By: Jerry Stuckle on Mon, 14 February 2011 17:57
		Re: How do I do this search and replace? By: spambait on Sun, 13 February 2011 01:48
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:01
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:05
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:13
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:33
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:44
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:49
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:53
		Re: How do I do this search and replace? By: me on Sun, 13 February 2011 13:32
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 13:37
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:53
		Re: How do I do this search and replace? By: Denis McMahon on Sun, 13 February 2011 04:16
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 04:34
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 04:50
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 05:35
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 06:11
		Re: How do I do this search and replace? By: sheldonlg on Sun, 13 February 2011 13:19
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:56
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 15:09
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 15:19
		Re: How do I do this search and replace? By: Denis McMahon on Sat, 12 February 2011 22:03
		Re: How do I do this search and replace? By: BootNic on Sat, 12 February 2011 22:51
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 00:21
		Re: How do I do this search and replace? By: Curtis Dyer on Mon, 14 February 2011 09:01
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:54
		Re: How do I do this search and replace? By: Erwin Moller on Mon, 14 February 2011 09:14
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:55
		Re: How do I do this search and replace? By: Erwin Moller on Mon, 14 February 2011 10:04
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 10:28
		Re: How do I do this search and replace? By: Curtis Dyer on Mon, 14 February 2011 10:40

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