This post jumped immediately to a dynamic regex solution to your problem. I have used dynamic regex before and it is a cool technique! However a hash table lookup could also be applicable?

For this you would put the ASC_,K1_ etc. tokens as keys in a hash table. Use a fixed regex to extract the XXX_YYY patterns. Then lookup if XXX_ exits in the hash table or not. Coding depends upon what your input data looks like.

Just a thought for you...

In reply to Re: Dynamic Regular Expression by Marshall
in thread Dynamic Regular Expression by Pratikh

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