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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 CENTOS

pcre16_compile

PCRE_COMPILE(3) 					     Library Functions Manual						   PCRE_COMPILE(3)

NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS


       #include <pcre.h>

       pcre *pcre_compile(const char *pattern, int options,
	    const char **errptr, int *erroffset,
	    const unsigned char *tableptr);

       pcre16 *pcre16_compile(PCRE_SPTR16 pattern, int options,
	    const char **errptr, int *erroffset,
	    const unsigned char *tableptr);

       pcre32 *pcre32_compile(PCRE_SPTR32 pattern, int options,
	    const char **errptr, int *erroffset,
	    const unsigned char *tableptr);

DESCRIPTION


       This  function compiles a regular expression into an internal form. It is the same as pcre[16|32]_compile2(), except for the absence of the
       errorcodeptr argument. Its arguments are:

	 pattern       A zero-terminated string containing the
			 regular expression to be compiled
	 options       Zero or more option bits
	 errptr        Where to put an error message
	 erroffset     Offset in pattern where error was found
	 tableptr      Pointer to character tables, or NULL to
			 use the built-in default

       The option bits are:

	 PCRE_ANCHORED		 Force pattern anchoring
	 PCRE_AUTO_CALLOUT	 Compile automatic callouts
	 PCRE_BSR_ANYCRLF	 R matches only CR, LF, or CRLF
	 PCRE_BSR_UNICODE	 R matches all Unicode line endings
	 PCRE_CASELESS		 Do caseless matching
	 PCRE_DOLLAR_ENDONLY	 $ not to match newline at end
	 PCRE_DOTALL		 . matches anything including NL
	 PCRE_DUPNAMES		 Allow duplicate names for subpatterns
	 PCRE_EXTENDED		 Ignore white space and # comments
	 PCRE_EXTRA		 PCRE extra features
				   (not much use currently)
	 PCRE_FIRSTLINE 	 Force matching to be before newline
	 PCRE_JAVASCRIPT_COMPAT  JavaScript compatibility
	 PCRE_MULTILINE 	 ^ and $ match newlines within data
	 PCRE_NEWLINE_ANY	 Recognize any Unicode newline sequence
	 PCRE_NEWLINE_ANYCRLF	 Recognize CR, LF, and CRLF as newline
				   sequences
	 PCRE_NEWLINE_CR	 Set CR as the newline sequence
	 PCRE_NEWLINE_CRLF	 Set CRLF as the newline sequence
	 PCRE_NEWLINE_LF	 Set LF as the newline sequence
	 PCRE_NO_AUTO_CAPTURE	 Disable numbered capturing paren-
				   theses (named ones available)
	 PCRE_NO_UTF16_CHECK	 Do not check the pattern for UTF-16
				   validity (only relevant if
				   PCRE_UTF16 is set)
	 PCRE_NO_UTF32_CHECK	 Do not check the pattern for UTF-32
				   validity (only relevant if
				   PCRE_UTF32 is set)
	 PCRE_NO_UTF8_CHECK	 Do not check the pattern for UTF-8
				   validity (only relevant if
				   PCRE_UTF8 is set)
	 PCRE_UCP		 Use Unicode properties for d, w, etc.
	 PCRE_UNGREEDY		 Invert greediness of quantifiers
	 PCRE_UTF16		 Run in pcre16_compile() UTF-16 mode
	 PCRE_UTF32		 Run in pcre32_compile() UTF-32 mode
	 PCRE_UTF8		 Run in pcre_compile() UTF-8 mode

       PCRE must be built with UTF support in order to use PCRE_UTF8/16/32 and PCRE_NO_UTF8/16/32_CHECK, and with UCP support if PCRE_UCP is used.

       The yield of the function is a pointer to a private data structure that contains the compiled pattern, or NULL if an  error  was  detected.
       Note  that  compiling regular expressions with one version of PCRE for use with a different version is not guaranteed to work and may cause
       crashes.

       There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.

PCRE 8.30							   24 June 2012 						   PCRE_COMPILE(3)
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