Exactly. This was my approach but before taking that up I wanted to check with the community whether Im doing anything wrong with regular expression. May be I expected too much from the regular expression. Anyway, thanks for your inputs :)
Re^6: Suggestion for regular expression speed improvement.
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Yes. My initial idea was to keep CSV, RE parsing separate but I thought may be If could get the same performance from RE, then need not to have a CSV parser. But now I understand that is not possible to think of. So, need to switch back to my old approach where I do two parsing separately. So, from the user interface user will have simple/advanced parsing modes. Thanks for your suggestion.