Dear Aristotle,

Sorry for coming back to you again. How can I extend/modify your invaluable code above so that it can handle ambiguous string like this: 
$str = '[TCG]TTCG[AT]';

[download]
The idea is exactly the same as my OP, only this time those characters under brackets [] is also considered as mismatch possibilities.

Please kindly keep, your original answer.

Regards,
Edward

In reply to Re^2: Finding Neighbours of a String by monkfan
in thread Finding Neighbours of a String by monkfan

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