On Sat, Jun 4, 2011 at 00:04, Eli Barzilay <e...@barzilay.org> wrote:
> Four minutes ago, Rodolfo Carvalho wrote: > > On Fri, Jun 3, 2011 at 23:49, Carl Eastlund <c...@ccs.neu.edu> wrote: > > > The origin of #px is "Perl-compatible regular expression", while > > > #rx are compatible with command-line tools such as egrep. > > > > It seems that it's not yet documented. Good to know, now I can > > choose between Perl and power :D > > See the top of http://docs.racket-lang.org/reference/regexp.html -- > it shows the basic shared syntax, and then there's > > The following completes the grammar for regexp, which treats { and } > as literals, \ as a literal within ranges, and \ as a literal > producer outside of ranges. > > and a bit later > > The following completes the grammar for pregexp, which uses { and } > bounded repetition and uses \ for meta-characters both inside and > outside of ranges. > > These blurbls summarize the difference, and the tables that follow > them specifies the syntax formally. > > Yes, I have that open here in another tab. I read that before posting my questions. What I pointed as "not yet documented" is the nomenclature "Perl-compatible regular expression". I just saw #rx, #px, their differences, and well, I even looked at *The Reader*, but I didn't figure out what the p was for... Thank you all for clarifying my doubts, []'s Rodolfo Carvalho
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