Login

Recent searches

No recent searches

Search options

Only available when logged in.
fosstodon.org is one of the many independent Mastodon servers you can use to participate in the fediverse.
Fosstodon is an invite only Mastodon instance that is open to those who are interested in technology; particularly free & open source software. If you wish to join, contact us for an invite.

Administered by:

Server stats:

10K
active users

fosstodon.org: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.6

Paul McGuire

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]
#python#pyparsing#regex
Mar 21, 2025, 05:57 AM·Public
3boosts·6favorites
Public
Paul McGuire

I should have tagged that with when I first posted it - doesn't look like adding a tag in an edit accomplishes much.

Public
Paul McGuire

I hope to release pyparsing 3.2.2 this weekend.

Public
Paul McGuire

This is not an exhaustive optimizer by any means - it does a poor job with the days of the week in English, even though they all end in "day".

ExploreLive feeds
About