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How to use regular expression to extract chemical formula
There are many chemical formulas in PDF files. I want to extract them. The chemical formulas are mostly like LiCoMnO4, 0.4Li2Mn0.06Ni0.2O4, K1/3Mn2/3Al2/9, H2(g), .... Is there anyone who can tell me what kind of regular expression can extract them?
Thank you very much.