The + essentially indicates that this is a character-class match. It's to distinguish things from <.alpha>, <?alpha>, <!alpha>, <-alpha>, and <alpha> (among others).
Pm On Fri, Aug 03, 2018 at 08:48:24PM +0200, Timo Paulssen wrote: > The + is required, perhaps because the first character after the opening > < is supposed to determine exactly what thing it is? Not sure about > that. The + and - is a bit like "start at nothing, add all alnums, then > subtract all alphas". The + after the < > is just to match it any number > of times, but at least once, and the $ at the end, together with the ^ > at the start, ensures that every character in the string has to match, > not just any character. > > Hope that makes sense > - Timo > > > On 03/08/18 20:04, ToddAndMargo wrote: > > On 08/02/2018 05:18 AM, Timo Paulssen wrote: > >> Is this what you want? > >> > >> perl6 -e 'say "12345" ~~ /^<+alnum -alpha>+$/' > >> ｢12345｣ > >> > >> perl6 -e 'say "123a45" ~~ /^<+alnum -alpha>+$/' > >> Nil > >> > >> HTH > >> - Timo > >> > > > > What does the following do? > > > > +alnum (why does it need the "+"?) > > -alpha (I presume "-" means negate?) > > +$ > > > > Many thanks, > > -T
