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
