Pattern all words must be present in regex

Programming in mysql: Pattern all words must be present in regex on newest questions tagged mysql – Stack Overflow

i want mutch pattern 2 word musst present, but the Result is null, why!!!please
in shell mysql:

select ‘only test bla dido simple’ REGEXP ‘^(\?=.\?(simple))(\?=.\?(only))*$’;

but the result is null!!!!

source: http://stackoverflow.com/questions/11207159/pattern-all-words-must-be-present-in-regex
Programming in mysql: programming-in-mysql