id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12959	Regex class negation	robic@…	John Maddock	"Pertains to boost::regex  
Tested on version 1.61 

Flags: Perl[[BR]]
Target string: abc092efg[[BR]]
Regex: `[^\W\D]+`[[BR]]

Function: regex_search[[BR]] 

Matches:  abc092efg[[BR]]

Should match:  092[[BR]]

Notes[[BR]]

Negative class resolution:  'Not-Not Word' AND 'Not-Not Digit'[[BR]]
The intersection of word AND digits is digits.[[BR]]

Every other regex engine does this correctly.[[BR]]
This includes Perl, PCRE, JS, C++11, Python, etc..[[BR]] 

In this engine, `[^\W\D]` matches what `[\w\d]` does.[[BR]]
`[^\W\D]` appears not to be an intersection as the operator in[[BR]]
a negative class is AND.[[BR]]

Fwiw - this behavior is seen with all negated shorthand elements of a[[BR]]
negative class, i.e. `[^\S\W]` matches all whitespace OR all word char's.[[BR]]

"	Bugs	new	To Be Determined	regex	Boost 1.61.0	Showstopper