How to find if a string contains all the certain characters?

For example:

Characters to match: 'czk'
string1: 'zack' Matches
string2: 'zak'  Does not match

I tried (c)+(k)+(z) and [ckz] which are obviously wrong. I feel this is a simple task, but i am unable to find a开发者_StackOverflow社区n answer

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The most natural way would probably to use sets rather than regex, like so

set('czk').issubset(s)

Code is very often simpler and easier to maintain without using regex much.

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Basically you have to sort the string first so you get "ackz" and then you can use a regex like /.*c.*k.*z.*/ to match against.