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I came up with this one, but it is far from perfect:

"""\s(\S{14,420}e\b|[])"""

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closed as off topic by Administrator♦♦ Jun 29 at 15:22

2 Answers

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OSCAR3, by Peter Murray-Rust, will do what you want. It's open source.

(BTW, This question is better suited to http://blueobelisk.shapado.com as it's about cheminformatics, not experimental chemistry)

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Thank you. I was sent here from Reddit/Chem. Slowly going the right direction. – Greg Jun 25 at 22:51
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Why do you need this, there are plenty of free programs out there that will convert a structure to a name or vice versa. Or convert a name to a SMIles string or an InChi of InChi key. The is even the Weisweisser line notation.

Apart from that your question is not very clear and clarification would be in order!

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for indexing a large set of text document against the chemicals which are described. so that the document set can be searched by chemical name. – Greg Jun 25 at 20:50

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