How can I match letters a,b,c once in any combination and varying length like this:
The expression should match these cases:
abc bc a b bca
but should not match these ones:
abz aab cc x
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Answer
Use regex pattern
b(?!w*(w)w*1)[abc]+b
You can use this pattern with any set and size, just replace [abc]
with desired set…
(above output is from myregextester)