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From: Serhiy Storchaka <storchaka@gmail.com>
Subject: Re: Letter class in re
Date: Mon, 09 Mar 2015 15:43:00 +0200
References: <54FD74BA.8010803@rece.vub.ac.be>	<mdjt75$jpu$1@ger.gmane.org> <20150309061736.07e0d944@bigbox.christie.dr> <54FD918B.1030702@rece.vub.ac.be>
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On 09.03.15 14:26, Antoon Pardon wrote:
> So if I understand correctly the following should be a regular expression for
> a python3 identifier.
>
>    (?:(?!_|\d)\w)\w+
>
> It seems odd that one should need such an ugly expression for something that is
> used rather frequently for parsing computer languages and the like.

Not all so easy.

 >>> allchars = ''.join(map(chr, range(sys.maxunicode+1)))
>>> ''.join(c for c in allchars if ('a'+c).isidentifier() and not (c+'a').isidentifier() and not c.isdigit())
'·̴̵̶̷̸̡̢̧̨̛̖̗̘̙̜̝̞̟̠̣̤̥̦̩̪̫̬̭̮̯̰̱̲̳̹̺̻̼͇͈͉͍͎̀́̂̃̄̅̆̇̈̉̊̋̌̍̎̏̐̑̒̓̔̽̾̿̀́͂̓̈́͆͊͋͌̕̚ͅ͏͓͔͕͖͙͚͐͑͒͗͛ͣͤͥͦͧͨͩͪͫͬͭͮͯ͘͜͟͢͝͞͠͡·ְֱֲֳִֵֶַָׇֹֺֻּֽֿׁׂًٌٍؘَؙُؚِّْٰܑ֑֖֛֢֣֤֥֦֧֪ׅٕٖٜٟۣ۪ۭܱܴܷܸܹܻܼܾ݂݄݆݈֚֭֮҃҄҅҆҇֒֓֔֕֗֘֙֜֝֞֟֠֡֨֩֫֬֯ׄؐؑؒؓؔؕؖؗٓٔٗ٘ٙٚٛٝٞۖۗۘۙۚۛۜ۟۠ۡۢۤۧۨ۫۬ܰܲܳܵܶܺܽܿ݀݁݃݅݇݉݊ަާިީުޫެޭޮޯްࣰࣱࣲ߲࡙࡚࡛ࣦࣩ࣭࣮࣯ࣶࣹࣺ߫߬߭߮߯߰߱߳ࠖࠗ࠘࠙ࠛࠜࠝࠞࠟࠠࠡࠢࠣࠥࠦࠧࠩࠪࠫࠬ࠭ࣤࣥࣧࣨ࣪࣫࣬ࣳࣴࣵࣷࣸࣻࣼࣽࣾࣿऀँंःऺऻ़ािीुूृॄॅॆेैॉॊोौ्ॎॏ॒॑॓॔ॕॖॗॢॣঁংঃ়ািীুূৃৄেৈোৌ্ৗৢৣਁਂਃ਼ਾਿੀੁੂੇੈੋੌ੍ੑੰੱੵઁંઃ઼ાિીુૂૃૄૅેૈૉોૌ્ૢૣଁଂଃ଼ାିୀୁୂ�
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