07-23-2013
Doesn't save much typing effort, but might be easier to read: ...[[:xdigit:]]{2}...
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7. Programming
file1
cat
dog
fish
file2
This is a bunch of lines
<!-- INSERT ANIMALS HERE -->
horse
cheetah
post results
file2
This is a bunch of lines
<!-- INSERT ANIMALS HERE -->
cat
dog
fish
horse (1 Reply)
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LEARN ABOUT REDHAT
iswxdigit
ISWXDIGIT(3) Linux Programmer's Manual ISWXDIGIT(3)
NAME
iswxdigit - test for hexadecimal digit wide character
SYNOPSIS
#include <wctype.h>
int iswxdigit(wint_t wc);
DESCRIPTION
The iswxdigit function is the wide-character equivalent of the isxdigit function. It tests whether wc is a wide character belonging to the
wide character class "xdigit".
The wide character class "xdigit" is a subclass of the wide character class "alnum", and therefore also a subclass of the wide character
class "graph" and of the wide character class "print".
Being a subclass of the wide character class "print", the wide character class "xdigit" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character class "xdigit" is disjoint from the wide character class "space"
and its subclass "blank".
Being a subclass of the wide character class "alnum", the wide character class "xdigit" is disjoint from the wide character class "punct".
The wide character class "xdigit" always contains at least the letters 'A' to 'F', 'a' to 'f' and the digits '0' to '9'.
RETURN VALUE
The iswxdigit function returns non-zero if wc is a wide character belonging to the wide character class "xdigit". Otherwise it returns
zero.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
isxdigit(3), iswctype(3)
NOTES
The behaviour of iswxdigit depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 ISWXDIGIT(3)