The issue doesn't seem to be the underscore, because I get the same result even when converting the underscore into a letter ('b'):
$ cat gentb.p6 grammar G0 { token TOP {<rport>|<ruport>.*} regex rport { <type>} rule ruport { <type>} #token type {<alpha>+} token type {<alnum>+} } grammar G1 { token TOP {<rport>|<ruport>.*} regex rport { <type>} rule ruport { <type>} token type {<alpha>+} #token type {<alnum>+} } my $str="scbin<foo> bar"; say "=========== <alnum> Example=============="; say G0.parse($str); say "=========== <alpha> Example=============="; say G1.parse($str); $ perl6 gentb.p6 =========== <alnum> Example============== Nil =========== <alpha> Example============== 「scbin<foo> bar」 ruport => 「scbin」 type => 「scbin」 alpha => 「s」 alpha => 「c」 alpha => 「b」 alpha => 「i」 alpha => 「n」 $ On Fri, Sep 28, 2018 at 02:26:41AM -0700, Brent Laabs wrote: > Are you sure about that? Underscore has been part of the specs (synopses) > for <alpha> for at least 10 years, probably longer. > > > "_" ~~ /<alpha>/ > 「_」 > alpha => 「_」 > > On Thu, Sep 27, 2018 at 7:52 PM Brandon Allbery <allber...@gmail.com> wrote: > > > "_" is not an alphabetic character. It's allowed in "alnum" because that > > is by intent what is \w in other regex implementations, which includes "_". > > > > On Thu, Sep 27, 2018 at 10:47 PM Vijayvithal <perl6-bugs-follo...@perl.org> > > wrote: > > > >> # New Ticket Created by Vijayvithal > >> # Please include the string: [perl #133541] > >> # in the subject line of all future correspondence about this issue. > >> # <URL: https://rt.perl.org/Ticket/Display.html?id=133541 > > >> > >> > >> In the attached code, the only difference between the Grammars G0 and G1 > >> is the defination of token 'type' it is defined as <alpha> in one case > >> and as <alnum> in another. > >> > >> Since the string being matched is 'sc_in' both the alpha and alnum > >> tokens should have captured it. But we see the following result on > >> execution > >> > >> =========== <alnum> Example============== > >> Nil > >> =========== <alpha> Example============== > >> 「sc_in<foo> bar」 > >> ruport => 「sc_in」 > >> type => 「sc_in」 > >> alpha => 「s」 > >> alpha => 「c」 > >> alpha => 「_」 > >> alpha => 「i」 > >> alpha => 「n」 > >> > >> > >> Perl Version is > >> > >> This is Rakudo Star version 2018.06 built on MoarVM version 2018.06 > >> implementing Perl 6.c. > >> > >> > >> > >> -- > >> Vijayvithal > >> Dyumnin Semiconductors > >> > > > > > > -- > > brandon s allbery kf8nh > > allber...@gmail.com > >