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Full Discussion: Regex issue with \s in character class.
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:

Quote:
\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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LEARN ABOUT OSF1

iso2022

iso2022(5)							File Formats Manual							iso2022(5)

NAME

       iso2022, iso-2022, ISO-2022 - A character encoding mechanism standardized by the International Standards Organization (ISO)

DESCRIPTION

       The ISO-2022 standard defines a mechanism for handling single-byte and multibyte characters. The standard specifies four classes of charac-
       ter sets: The 94-charset class, which contains character sets with 94 positions (single-byte characters).  Examples are the ASCII  and  JIS
       X0201 character sets.  The 96-charset class, which contains character sets with 96 positions (single-byte characters). Examples are the ISO
       Latin series of character sets.	The 94x94-charset class, which contains character sets with 94x94 positions (2-byte characters).  Examples
       are  the  GB  2312  and the CNS 11643 character sets.  The 96x96-charset class,	which contains character sets with 96x96 positions (2-byte
       characters).

       In the ISO-2022 standard, four registers, called G0, G1, G2 and G3, are used to reference a character set. Before a character  set  can	be
       used, the character set must be assigned, or designated, to one of these registers.  The designation of a character set is done by using an
       escape sequence in the following format:

       ESC [I] F

       In this format: Is an intermediate character that is used to designate a character set to one of the registers (G0, G1, G2, oR G3).   Is  a
       unique final character of a particular character set.

       The  designation of a character set, whose final character is F, to different registers is as follows: Designates a multibyte character set
       (94x94 or 96x96) to G0.	Designates a character set in the 94-charset class to G0.  Designates a character set in the 94-charset  class	to
       G1.   Designates  a  character  set in the 94-charset class to G2.  Designates a character set in the 94-charset class to G3.  Designates a
       character set in the 96-charset class to G1.  Designates a character set in the 96-charset class to G2.	Designates a character set in  the
       96-charset class to G3.

SEE ALSO

       Commands: locale(1)

       Others: ascii(5), i18n_intro(5), iso2022jp(5), l10n_intro(5)

																	iso2022(5)
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