I want to match strings that don't have abc, def or ghi. The opposite is easy:
/(abc|def|ghi)/
How do I reverse that? I don't want to
/(^abc|^def|^ghi)/
because there's going to be more 'logic' in there. (If that's even what it does.)
How do I reverse the whole group match (or whatever it's called)?
(I'm trying to beat 5. on /)
I want to match strings that don't have abc, def or ghi. The opposite is easy:
/(abc|def|ghi)/
How do I reverse that? I don't want to
/(^abc|^def|^ghi)/
because there's going to be more 'logic' in there. (If that's even what it does.)
How do I reverse the whole group match (or whatever it's called)?
(I'm trying to beat 5. on http://regex.alf.nu/)
Share Improve this question edited Dec 20, 2013 at 19:35 Rudie asked Dec 20, 2013 at 18:53 RudieRudie 53.9k42 gold badges135 silver badges175 bronze badges4 Answers
Reset to default 9Use negative lookaead:
/^(?!.*?(abc|def|ghi)).*$/
You need to define the capture group including the start (^) and end of the string ($), or you'll end up with false positive matches:
/^((?!(abc|def|ghi)).)*$/
This will match:
- bob
- joe
This will not match:
- abc
- def
- ghi
- bobabc
- abcjoe
See it in action here: http://regex101./r/yI3tF4
Solution to 5. on http://regex.alf.nu/ : ^((?!(.)(.)\3\2).)*$
Explanation : Regular expression to match a line that doesn't contain a word?
Using negative lookaheads :
/^(?!.*abc)(?!.*def)(?!.*ghi)/
/^(?!.*(abc|def|ghi))/