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Top Forums Shell Programming and Scripting Unable to identify the special characters beyond the range of "[\x80-\xFF]" Post 302957726 by bakunin on Wednesday 14th of October 2015 09:58:38 AM
Old 10-14-2015
Quote:
Originally Posted by Abhijit Sen
I want to filter out the special character whose ascii value doesn't fall within the range "[\x80-\xFF]"
You might want to use the :print: character class the POSIX BRE regexp provide and negate that: [^:print:] and see how far that gets you.

Basically there is no pattern for what constitutes a printable or non-printable character: character "\9", which is a TAB just is that by convention, not because it is - in principle - any different from "\10" or "\8".

You might also want to identify your locale, which may establish so-called collating sequences. See more about this at this page.

I hope this helps.

bakunin

Last edited by bakunin; 10-14-2015 at 11:03 AM..
 

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ISWPRINT(3)						     Linux Programmer's Manual						       ISWPRINT(3)

NAME
iswprint - test for printing wide character SYNOPSIS
#include <wctype.h> int iswprint(wint_t wc); DESCRIPTION
The iswprint() function is the wide-character equivalent of the isprint(3) function. It tests whether wc is a wide character belonging to the wide-character class "print". The wide-character class "print" is disjoint from the wide-character class "cntrl". The wide-character class "print" contains the wide-character class "graph". RETURN VALUE
The iswprint() function returns nonzero if wc is a wide character belonging to the wide-character class "print". Otherwise, it returns zero. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------+---------------+----------------+ |Interface | Attribute | Value | +-----------+---------------+----------------+ |iswprint() | Thread safety | MT-Safe locale | +-----------+---------------+----------------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99. NOTES
The behavior of iswprint() depends on the LC_CTYPE category of the current locale. SEE ALSO
isprint(3), iswctype(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU
2015-08-08 ISWPRINT(3)
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