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    <p>I'm well-aware this answer might be off-topic (as in the approach), but I think it is quite interesting, and it solves the OP's problem.</p> <p>If you don't mind learning a new language (Prolog), then it might help you generate all possible combinations:</p> <pre><code>name(X) :- member(X, ['h', 's', 'hg', 'ga', 'as']). parse_([], []). parse_(InList, [HeadAtom | OutTail]) :- atom_chars(InAtom, InList), name(HeadAtom), atom_concat(HeadAtom, TailAtom, InAtom), atom_chars(TailAtom, TailList), parse_(TailList, OutTail). parse(In, Out) :- atom_chars(In, List), parse_(List, Out). </code></pre> <p>Sample run:</p> <pre><code>?- parse('hgas', Out). Out = [h, ga, s] ; Out = [hg, as] ; false. </code></pre> <hr> <p>The improved version, which includes processing for number is a tad bit longer:</p> <pre><code>isName(X) :- member(X, ['h', 's', 'hg', 'ga', 'as', 'o', 'c']). % Collect all numbers, since it will not be part of element name. collect([],[],[]). collect([H|T], [], [H|T]) :- \+ char_type(H, digit), !. collect([H|T], [H|OT], L) :- char_type(H, digit), !, collect(T, OT, L). parse_([], []). parse_(InputChars, [Token | RestTokens]) :- atom_chars(InputAtom, InputChars), isName(Token), atom_concat(Token, TailAtom, InputAtom), atom_chars(TailAtom, TailChars), parse_(TailChars, RestTokens). parse_(InputChars, [Token | RestTokens]) :- InputChars = [H|_], char_type(H, digit), collect(InputChars, NumberChars, TailChars), atom_chars(Token, NumberChars), parse_(TailChars, RestTokens). parse(In, Out) :- atom_chars(In, List), parse_(List, Out). </code></pre> <p>Sample run:</p> <pre><code>?- parse('hgassc20h245o', X). X = [h, ga, s, s, c, '20', h, '245', o] ; X = [hg, as, s, c, '20', h, '245', o] ; false. ?- parse('h2so4', X). X = [h, '2', s, o, '4'] ; false. ?- parse('hgas', X). X = [h, ga, s] ; X = [hg, as] ; false. </code></pre>
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    1. POFind all possible permutations of a lowercase chemical formula
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    1. POFind all possible permutations of a lowercase chemical formula
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    1. CO+1 beautiful !!
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    2. COThis is pretty impressive. Could it be modified to handle numbers in between that would reduce ambiguity? "h2so4"
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      1. USLucent
    3. COI think adding numbers to the list in members could work. Not the most elegant way, but doing something like `['h', 's', 'hg', 'ga', 'as', '1', '2' .....]` would be ok for test purposes. Adding the line `name(X) :- integer(X)`. would be better
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