Regex basics

[Brother Bill]

Where can I find a REGEX class that does the basics?

[rfo amalasoft.com]

The Eiffel distribution includes, in the contrib folders, the Gobo libraries and they include very good regular expression support.

R

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From: eiffel...@googlegroups.com <eiffel...@googlegroups.com> on behalf of Brother Bill <brother...@gmail.com>
Sent: Saturday, June 1, 2024 11:15 AM
To: Eiffel Users <eiffel...@googlegroups.com>
Subject: [eiffel-users] Regex basics

 

Where can I find a REGEX class that does the basics?

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[Brother Bill]

What are the steps for finding the contrib folders or the Gobo libraries, and then incorporating them into the project?

[rfo amalasoft.com]

The library is installed by default, or at least it was last time I checked.  Therefore, you need only call it out in your ecf file.

            <library name="gobo_regexp" location="$ISE_LIBRARY\library\gobo\gobo_regexp.ecf">

                  <option warning="none">

                  </option>

            </library>

R

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From: eiffel...@googlegroups.com <eiffel...@googlegroups.com> on behalf of Brother Bill <brother...@gmail.com>

Sent: Sunday, June 2, 2024 4:02 PM
To: Eiffel Users <eiffel...@googlegroups.com>
Subject: Re: [eiffel-users] Regex basics

 

To view this discussion on the web visit https://groups.google.com/d/msgid/eiffel-users/f645d6aa-65c4-4417-a4ff-71e3152f50c9n%40googlegroups.com.

[Jocelyn Fiat]

Using the "Project settings" dialog from EiffelStudio, click on "Groups" on the tree.

Then in the toolbar, click on "Add Library (Ctrl+L)"

in the "filter" text field enter "regexp"

You get a list of libraries, among them

- "regexp": the mentioned GOBO Regexp library

   $ISE_LIBRARY\contrib\library\gobo\library\regexp\src\library.ecf

 

- "PCRE": similar to Gobo Regexp library, but without dependencies on Gobo libraries

   $ISE_LIBRARY\unstable\library\text\regexp\pcre\pcre.ecf

- "kmp_matcher": not really for regexp, but wild char  (using * and ? )

  $ISE_LIBRARY\library\text\regexp\kmp_matcher\kmp_matcher.ecf

Select the one you want, and click at the bottom on the button "[Include]"

I hope this helps

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Jocelyn
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[Brother Bill]

Jocelyn Fiat,  That got me most of the way.  

For this case, testing for a regular expression match was sufficient for my needs at this time.

Note that Eiffel STRINGs treat the backslash character as just another character.  In Eiffel, "%N" is newline, not "\n".
Of course, we now have to watch out for "%", which are less common, especially in regular expressions.
Thus, there is no need to double backslashes or resort to another literal string mode as in C#.

Here is a link to a working example based on OOSC2, page 423.
https://www.adrive.com/public/q6B66P/p423%20Regex.zip

Examine INTEGER_READER lines 60 - 79.  (And yes, I know about once functions, but that hasn't been introduced in OOSC2 by page 423)

Also enclosed are step by step instructions.