Question

I have 7 items…

a b c d e f and g

The seven items can be in any order. How to I check with regex that they are there (or not) but no other items are…

^(a)?(b)?(c)?(d)?(e)?(f)?(g)?$

Thad would check for the seven items with any combination of items missing, but only in that order. How do I have the regex check for any possible order of the 7 items?

Both of these would pass:

abcdefg
aceg

I need these to pass as well

bc
fabcd
bgef

I’m using single letters to simplify things. For example (\stest)? would be an example of one of the items (\skey="([^"<>]+)?")? is another… I would like to prevent duplicates as well.

These should not pass

abca
aa
gfdef

Answer 1

Something like this would work:

^(?!(.*(a|b|c|d|e|f|g).*(\2)))((a|b|c|d|e|f|g)+)$