Top Forums Shell Programming and Scripting Regex issue with \s in character class. Post 303042665 by blackrageous on Thursday 2nd of January 2020 07:21:53 PM
Interesting. I was using the linux...egrep (posix) and was just surprised when it didn't work.

--- Post updated at 19:21 ---

That seems to explain it. Thanks.
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ISWXDIGIT(3)						     Linux Programmer's Manual						      ISWXDIGIT(3)

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
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)

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