In perl, I have a string that roughly looks like
my $str = "one 10 two 20 three 30";
Now, I'd like to split that string into word-number pairs, but have no success.
I thought I could do a
my @pairs = split /([a-z]+[^a-z]+)/, $str;
and would then have
$pairs[0] eq 'one 10 '
$pairs[1] eq 'two 20 '
$pairs[2] eq 'three 30'
However, I get
$pairs[0] eq ' '
$pairs[1] eq 'one 10 '
$pairs[2] eq ' '
$pairs[3] eq 'two 20 '
$pairs[4] eq ' '
$pairs[5] eq 'three 30'
Now, I can use grep for my desired result:
my @pairs = grep {$_ =~ /\S/} split /([a-z]+[^a-z]+)/, $str;
But I was wondering if there was a more elegant solution to this problem.
Why split them as pairs? Just get a list of words then take them by twos.
my @words = split /\s+/, $str;
while( @words ) {
my( $first, $second ) = splice @words, 0, 2;
...;
}
If you want a hash, it's even simpler:
my %pairs = split /\s+/, $str;
I find that much easier to understand and pass on to another programmer than a regex.
不知道它是否是一个优雅的解决方案,你可以使用与/g
修饰符匹配:
my @pairs = $str =~ /(\w+\s+\d+)/g;
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