Hi Peter, On 30.05.2014 20:46, Peter Schwenn wrote: > Dear Perl6istes, > > How does one express in a perl6 match pattern that if a certain > subpattern is present the match fails. > > I had expected something like: > > $txt ~~ s/... -[ unwanted \s+ pattern ] .../ .../; > > but its not that. Can't find it in S05.
The reason it's not that simple is that it's not enough to say what *shouldn't* match; you also have to specify the pattern that *should* match, even if it's .*. Say you want to match two numbers that are separated by a word that's not 'perl', you'd write / \d+ <!before perl> \w+ \d+ / So, you solve it with a negative look-ahead. Cheers, Moritz
