https://perldoc.perl.org/5.42.0-RC1/perlrecharclass
perlrecharclass - Perl Regular Expression Character Classes - Perldoc Browser
perl regular expressioncharacter classesbrowser
https://perldoc.pl/5.26.1/perlrebackslash
perlrebackslash - Perl Regular Expression Backslash Sequences and Escapes - Perldoc Browser
perl regular expressionbackslashsequencesescapesbrowser
https://www.boost.org/doc/libs/1_42_0/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html
Perl Regular Expression Syntax
perl regular expressionsyntax
https://myfaqbase.com/q0000757-Scripting-Perl-Regular-Expression-How-to-count-number-of-leading-pipe-character.html
Scripting::Perl::Regular Expression::How to count number of leading pipe character
perl regular expressionhow to countscriptingnumberleading
https://support2.windriver.com/index.php?page=defects&on=view&id=LIN9-6165
LIN9-6165 - grep can not support Perl regular expression in WRLinux 8 project
Wind River is a world leader in embedded software for intelligent connected systems. The company has been pioneering computing inside embedded devices since...
perl regular expressiongrepsupportproject
https://www.freshports.org/textproc/cl-ppcre-sbcl/
FreshPorts -- textproc/cl-ppcre-sbcl: Portable Perl-Compatible Regular Expression for Common Lisp
CL-PPCRE is a fast, Perl compatible implementation of regular expressions written in portable, ANSI-compliant Common Lisp. This package installs binaries for...
regular expressioncommon lispfreshportstextproccl