我对下面的正则表达式感到困惑.请帮我理解一下.
my $test = "fred andor Berry"; if ($test =~ /fred (and|or) Berry/) { print "Matched!\n"; } else { print "Did not match!\n"; }
我认为它会匹配,但我得到“不匹配!”.如果我加入它,像这样,
my $test = "fred andor Berry"; if ($test =~ /fred (and|or)+ Berry/) { print "Matched!\n"; } else { print "Did not match!\n"; }
然后匹配.我以为我可以使用和/或将表达式与“and”,“or”和“andor”匹配.没有?