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Pyparsing 3.2.2 cleans up a formerly internal-only utility method make_compressed_re(), and makes it part of the public API. Given a list of strings, it generates a regex to match those strings and only those (so no cheating like ".*").
Here are before/after expressions for matching chemical symbols.
![A regular expression for matching chemical symbols:
Ac|Ag|Al|Am|Ar|As|At|Au|Ba|Be|Bh|Bi|Bk|Br|B|Ca|Cd|Ce|Cf|Cl|Cm|Cn|
Co|Cr|Cs|Cu|C|Db|Ds|Dy|Er|Es|Eu|Fe|Fl|Fm|Fr|F|Ga|Gd|Ge|He|Hf|Hg|
Ho|Hs|H|In|Ir|I|Kr|K|La|Li|Lr|Lu|Lv|Mc|Md|Mg|Mn|Mo|Mt|Na|Nb|Nd|Ne
|Nh|Ni|No|Np|N|Og|Os|O|Pa|Pb|Pd|Pm|Po|Pr|Pt|Pu|P|Ra|Rb|Re|Rf|Rg|
Rh|Rn|Ru|Sb|Sc|Se|Sg|Si|Sm|Sn|Sr|S|Ta|Tb|Tc|Te|Th|Ti|Tl|Tm|Ts|U|V|
W|Xe|Yb|Y|Zn|Zr
An optimized regular expression for matching chemical symbols:
A[cglmrstu]|B[aehikr]?|C[adeflmnorsu]?|D[bsy]|E[rsu]|F[elmr]?|G[ade]
|H[efgos]?|I[nr]?|Kr?|L[airuv]|M[cdgnot]|N[abdehiop]?|O[gs]?|P[abdmo
rtu]?|R[abefghnu]|S[bcegimnr]?|T[abcehilms]|U|V|W|Xe|Yb?|Z[nr]](https://cdn.fosstodon.org/media_attachments/files/114/198/875/625/401/287/original/96f306559e141ad9.jpg "A regular expression for matching chemical symbols:
Ac|Ag|Al|Am|Ar|As|At|Au|Ba|Be|Bh|Bi|Bk|Br|B|Ca|Cd|Ce|Cf|Cl|Cm|Cn|
Co|Cr|Cs|Cu|C|Db|Ds|Dy|Er|Es|Eu|Fe|Fl|Fm|Fr|F|Ga|Gd|Ge|He|Hf|Hg|
Ho|Hs|H|In|Ir|I|Kr|K|La|Li|Lr|Lu|Lv|Mc|Md|Mg|Mn|Mo|Mt|Na|Nb|Nd|Ne
|Nh|Ni|No|Np|N|Og|Os|O|Pa|Pb|Pd|Pm|Po|Pr|Pt|Pu|P|Ra|Rb|Re|Rf|Rg|
Rh|Rn|Ru|Sb|Sc|Se|Sg|Si|Sm|Sn|Sr|S|Ta|Tb|Tc|Te|Th|Ti|Tl|Tm|Ts|U|V|
W|Xe|Yb|Y|Zn|Zr
An optimized regular expression for matching chemical symbols:
A[cglmrstu]|B[aehikr]?|C[adeflmnorsu]?|D[bsy]|E[rsu]|F[elmr]?|G[ade]
|H[efgos]?|I[nr]?|Kr?|L[airuv]|M[cdgnot]|N[abdehiop]?|O[gs]?|P[abdmo
rtu]?|R[abefghnu]|S[bcegimnr]?|T[abcehilms]|U|V|W|Xe|Yb?|Z[nr]")
I hope to release pyparsing 3.2.2 this weekend.