How to match any combination of letters using regex?

Question

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

JavaScript
​x
 
abcbcabbca​

but should not match these ones:

abz
aab
cc
x

JavaScript
 
abzaabccx​

Answer

Use regex pattern

b(?!w*(w)w*1)[abc]+b

JavaScript
 
b(?!w*(w)w*1)[abc]+b​

You can use this pattern with any set and size, just replace [abc] with desired set…

Example:

enter image description here

(above output is from myregextester)

Accepted Answer

Use regex patternb(?!w*(w)w*1)[abc]+bYou can use this pattern with any set and size, just replace [abc] with desired set&#8230;Example:(above output is from myregextester)

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Answer