disallow repetition of given set of characters

Question

I need to make a regex which will reject string with any given character in set next to each other

". / - ( )"

For example:

123()123 - false
123--123 - false
124((123 - false
123(123)123-12-12 - true

This is what i have done so far:

(?:([\/().-])(?!.*\1))

Answer 1

^((?![\/().-]{2}).)*$

This simply negates the regex [\/().-]{2} which matches if two of your characters are next to each other.

See this answer for further explanation.

Live demo

Answer 2

You can use :

(^(?:(?![.\/()-]{2}).)*$)

DEMO

Explanation :

Answer 3

Maybe it is easier to do it other way around, match strings you don't want to allow.

if match [.\/()-]{2}
   not allowed
else
   allowed
end