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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 an answer
The most natural way would probably to use sets rather than regex, like so
Code is very often simpler and easier to maintain without using regex much.