Letter class in re

[Albert-Jan Roskam]

On Tue, 3/10/15, Antoon Pardon <antoon.pardon at rece.vub.ac.be> wrote:

 Subject: Re: Letter class in re
 To: python-list at python.org
 Date: Tuesday, March 10, 2015, 9:35 AM
 
 Op 09-03-15 om 17:11
 schreef Steven D'Aprano:
 > Antoon
 Pardon wrote:
 >
 >>
 I am using PLY for a parsing task which uses re for the
 lexical
 >> analysis. Does anyone
 >> know what regular expression to use
 for a sequence of letters? There is
 >>
 a class for alphanumerics but I can't find one for just
 letters, which I
 >> find odd.
 >>
 >> I am using
 python 3.4
 >
 > The re
 module in Python is pretty old and basic. Can you use
 Matthew
 > Barnett's regex module,
 available on PyPI? I understand it has a richer set
 > of flags for things such as Unicode
 letters and the like.
 
 Not
 really. I could use regex to build a lexer but that would
 mean having to do
 a lot of extra work, since
 I couldn't use the abstraction that is offered by
 PLY.lex.
 PLY.yacc allows the use of a
 different lexer but PLY.lex doesn't allow the use
 of a different regular expression engine.
 

--> Perhaps you could use/abuse Pygments? http://pygments.org/docs/lexerdevelopment/