Does Ruby regular expression have a not match operator like "!~" in Perl?

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.

Solution 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

Solution 2:

AFAIK (?!xxx) is supported:

2.1.5 :021 > 'abc1234' =~ /^abc/
 => 0
2.1.5 :022 > 'def1234' =~ /^abc/
 => nil
2.1.5 :023 > 'abc1234' =~ /^(?!abc)/
 => nil
2.1.5 :024 > 'def1234' =~ /^(?!abc)/
 => 0