Question

I just want to know whether ruby regex has a not match operator just like !~ in perl. I feel it’s inconvenient to use (?!xxx)or (?<!xxxx) because you cannot use regex patterns in the xxx part.

Answer 1

Yes: !~ works just fine – you probably thought it wouldn’t because it’s missing from the documentation page of Regexp. Nevertheless, it works:

irb(main):001:0> 'x' !~ /x/
=> false
irb(main):002:0> 'x' !~ /y/
=> true