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Top Forums Shell Programming and Scripting Regex issue with \s in character class. Post 303042635 by jim mcnamara on Wednesday 1st of January 2020 11:07:58 PM
Old 01-02-2020
It is a shorthand character class that mostly expands to [ \f\t\n\v] -- it is shorthand for a character class, like \d and others

Explained here:.

Regexp Tutorial - Shorthand Character Classes has this for \s:

\s stands for “whitespace character”¯. Again, which characters this actually includes, depends on the regex flavor. In all flavors discussed in this tutorial, it includes [ \t\r\n\f]. That is: \s matches a space, a tab, a line break, or a form feed. Most flavors also include the vertical tab, with Perl (prior to version 5.18) and PCRE (prior to version 8.34) being notable exceptions. In flavors that support Unicode, \s normally includes all characters from the Unicode “separator”¯ category. Java and PCRE are exceptions once again. But JavaScript does match all Unicode whitespace with \s.
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ISWDIGIT(3)						     Linux Programmer's Manual						       ISWDIGIT(3)

iswdigit - test for decimal digit wide character SYNOPSIS
#include <wctype.h> int iswdigit(wint_t wc); DESCRIPTION
The iswdigit function is the wide-character equivalent of the isdigit function. It tests whether wc is a wide character belonging to the wide character class "digit". The wide character class "digit" is a subclass of the wide character class "xdigit", and therefore also a subclass of the wide character class "alnum", 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 "digit" is disjoint from the wide character class "cntrl". Being a subclass of the wide character class "graph", the wide character class "digit" 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 "digit" is disjoint from the wide character class "punct". The wide character class "digit" is disjoint from the wide character class "alpha" and therefore also disjoint from its subclasses "lower", "upper". The wide character class "digit" always contains exactly the digits '0' to '9'. RETURN VALUE
The iswdigit function returns non-zero if wc is a wide character belonging to the wide character class "digit". Otherwise it returns zero. CONFORMING TO
isdigit(3), iswctype(3) NOTES
The behaviour of iswdigit depends on the LC_CTYPE category of the current locale. GNU
1999-07-25 ISWDIGIT(3)

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