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Full Discussion: Change all filenames in a directory
Top Forums Shell Programming and Scripting Change all filenames in a directory Post 302354315 by EAGL€ on Thursday 17th of September 2009 07:02:09 PM
Old 09-17-2009
Hi Crumb,

As far as i know /[A-Za-z0-9]/ works well in most cases instead of /[[:alnum:]]/ ,sou can try /[A-Za-z0-9]+/ instead of repeating alnum too. But below it is explained better. i got this part from a web page that was recommended by one of our moderators here, so check it:
http://www.gnu.org/software/gawk/manual/gawk.pdf

For example, before the POSIX standard, you had to write /[A-Za-z0-9]/ to match
alphanumeric characters. If your character set had other alphabetic characters in it, this
would not match them, and if your character set collated differently from ASCII, this might not even match the ASCII alphanumeric characters. With the POSIX character classes, you can write /[[:alnum:]]/ to match the alphabetic and numeric characters in your character set.
 

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LEARN ABOUT OPENDARWIN

iswalnum

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

NAME

       iswalnum - test for alphanumeric wide character

SYNOPSIS

       #include <wctype.h>

       int iswalnum(wint_t wc);

DESCRIPTION

       The  iswalnum() function is the wide-character equivalent of the isalnum(3) function.  It tests whether wc is a wide character belonging to
       the wide-character class "alnum".

       The wide-character class "alnum" is a subclass of the wide-character class "graph", and therefore also a  subclass  of  the  wide-character
       class "print".

       Being a subclass of the wide-character class "print", the wide-character class "alnum" is disjoint from the wide-character class "cntrl".

       Being  a  subclass  of the wide-character class "graph", the wide-character class "alnum" is disjoint from the wide-character class "space"
       and its subclass "blank".

       The wide-character class "alnum" is disjoint from the wide-character class "punct".

       The wide-character class "alnum" is the union of the wide-character classes "alpha" and "digit".  As such, it also contains the	wide-char-
       acter class "xdigit".

       The wide-character class "alnum" always contains at least the letters 'A' to 'Z', 'a' to 'z' and the digits '0' to '9'.

RETURN VALUE

       The  iswalnum()	function  returns  nonzero if wc is a wide character belonging to the wide-character class "alnum".  Otherwise, it returns
       zero.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+----------------+
       |Interface  | Attribute	   | Value	    |
       +-----------+---------------+----------------+
       |iswalnum() | Thread safety | MT-Safe locale |
       +-----------+---------------+----------------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES

       The behavior of iswalnum() depends on the LC_CTYPE category of the current locale.

SEE ALSO

       isalnum(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							       ISWALNUM(3)
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