Equivalence classes don't work


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# 8  
Quote:
Originally Posted by jim mcnamara
Looks okay. Next, tr has problems with equivlence classes
Code:
[aªáàâãäå]

This is the long form of an equivalence class. Try it (use whatever letter is handy)
Code:
echo "aªáàâãäå" | sed 's/[aªáàâãäå...]/a/g'

On Linux this fails for me:
Code:
$ echo "aªáàâãäå" | sed 's/[=a=]/x/g'
xªáàâãäå

The tr man page I have:

Try sed and use full classes to get past GNU problems. For Solaris I have no good answers, my home version is Solaris 9, and it is not POSIX compliant.
I see. I was aware GNU sed had issues with multi-byte characters, like I mentioned in my first post. I was just confused why it didn't work on Solaris either.


Quote:
Originally Posted by Scrutinizer
On Solaris 10, I tried the following, using the POSIX compliant utilities which are in /usr/xpg[46]/bin:

Code:
$ export PATH=/usr/xpg6/bin:/usr/xpg4/bin:$PATH
$ printf "%s\n" Estrés Miraré http://ën.wikipedia.org | LC_CTYPE=es_MX.UTF-8 LC_COLLATE=es_MX.UTF-8 tr '[=ë=]' x
Estrés
Miraré
http://xn.wikipedia.org
$ printf "%s\n" Estrés Miraré http://ën.wikipedia.org | LC_CTYPE=es_MX.UTF-8 LC_COLLATE=es_MX.UTF-8 sed 's/[[=ë=]]/x/g'
xstrxs
Mirarx
http://xn.wikipxdia.org

So tr did not work, but sed did

On Linux I had the same experience, but tr also gave an error message, so it appears it only uses single byte characters and it does not understand equivalence classes, but sed worked:

Code:
$ printf "%s\n" Estrés Miraré http://ën.wikipedia.org | LC_CTYPE=es_MX.UTF-8 LC_COLLATE=es_MX.UTF-8 tr '[=ë=]' x
tr: \303\253: equivalence class operand must be a single character
$ printf "%s\n" Estrés Miraré http://ën.wikipedia.org | LC_CTYPE=es_MX.UTF-8 LC_COLLATE=es_MX.UTF-8 sed 's/[[=ë=]]/x/g'
xstrxs
Mirarx
http://xn.wikipxdia.org

This works! I forgot sed you can use globs with a replace script in sed.
Thank you all for your help!

Now, I assume that in this case the problem wasn't that equivalence classes didn't work, but it had something to do with tr. But I don't understand why they don't work in globs either:
Code:
$ ls -1
bin
Descargas
Documentos
Escritorio
Imágenes
Música
Plantillas
Público
Vídeos

$ printf '%s\n' *[[=u=]]*
Documentos
Estudio

Shouldn't Música and Público have appeared in the output of printf?
# 9  
It appears that it has been implemented in the system's regex engine, but that it does not work with globbing. On Linux, in bash 4 compare:
Code:
$ touch Miraré
$ for file in M*; do if [[ $file == M*[[=e=]]* ]]; then echo "$file"; fi; done
$ for file in M*; do if [[ $file =~ ^M.*[[=e=]] ]]; then echo "$file"; fi; done
Miraré
$

I found this for Linux Standard Base Core Specification 4.1: Pattern Matching Notation
Quote:
Utilities that perform filename pattern matching (also known as Filename Globbing) shall do it as specified in POSIX 1003.1-2001 (ISO/IEC 9945-2003), Pattern Matching Notation, with the following exceptions:

Pattern bracket expressions (such as [a-z]) can be based on code point order instead of collating element order.

Equivalence class expression (such as [=a=]) and multi-character collating element expression (such as [.ch.]) are optional.

Handling of a multi-character collating element is optional.

This affects at least the following utilities: cpio (cpio), find and tar (tar).
I do not know what is the case with Solaris 10. It may be that the equivalence classes were not specified in POSIX.1–2001 . Perhaps it was in Solaris 11, you would have to try that out...

Last edited by Scrutinizer; 12-17-2019 at 12:58 AM..
These 3 Users Gave Thanks to Scrutinizer For This Post:
# 10  
Quote:
Originally Posted by Scrutinizer
It appears that it has been implemented in the system's regex engine, but that it does not work with globbing. On Linux, in bash 4 compare:
Code:
$ touch Miraré
$ for file in M*; do if [[ $file == M*[[=e=]]* ]]; then echo "$file"; fi; done
$ for file in M*; do if [[ $file =~ ^M.*[[=e=]] ]]; then echo "$file"; fi; done
Miraré
$

I found this for Linux Standard Base Core Specification 4.1: Pattern Matching Notation


I do not know what is the case with Solaris 10. It may be that the equivalence classes were not specified in POSIX.1–2001 . Perhaps it was in Solaris 11, you would have to try that out...
I see. Well, on the one hand it's good they're available in regular expressions but it would be convenient to have them available as globs as well, especially for characters that I can't easily type using my keyboard without a long key combination and memorizing numbers.


Thanks for your help, Scrutinize!
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