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From: Victor Porton <porton@narod.ru>
Newsgroups: comp.lang.ada
Subject: Re: Comparing version numbers
Date: Mon, 13 Nov 2017 17:56:14 +0200
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Date: 2017-11-13T17:56:14+02:00
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Dmitry A. Kazakov wrote:

> On 13/11/2017 03:39, Victor Porton wrote:
>> Not sure if it is quite on-topic, because it is more about general
>> programming ideas rather than about Ada. (However, a solution in Python
>> or Ruby or JavaScript would more likely used regexps than Ada.)
> 
> I doubt regular expressions would help here, or any other kind of text
> patterns language. It is not a pattern matching problem.
> 
>> Suppose I have two version numbers of a software. I need to check which
>> of the two is greater.
>> 
>> Lexical order string comparison does not work:
>> 
>> "2.3" vs "11.4".
>> 
>> I could split it by "." and compare the numbers. But a component of a
>> version numbers may be nonnumeric like:
>> 
>> "1.2beta".
>> 
>> What to do?
> 
> Is it what you are looking for:
> 
>     http://www.dmitry-kazakov.de/ada/strings_edit.htm#11

Yes.

But what is the difference between Compare_Textually and 
Compare_Lexicographically?

"This function compares two strings as texts." What does "compares as text" 
mean?

-- 
Victor Porton - http://portonvictor.org