Perl:删除行中的空格

时间:2012-05-30 09:40:56

标签: perl

我有以下文件:

firstname=John
name=Smith
address=Som
 ewhere

如您所见,地址位于2行(第二行以空格开头)。

我必须将“好”输出(带有“address = Somewhere”)写入另一个文件。

这是我写的第一个脚本(有点复杂):

foreach $line (@fileIN) {
    if ($lastline eq "") {
        $lastline = $line;
    } else {
        if ($line =~/^\s/) {
            print $line;
            $line =~s/^\s//;
            $lastline =~s/\n//;
            $lastline = $lastline.$line;
        } else {
            print fileOUT $lastline;
            $lastline = $line;
        }
    }
}

$ line =〜/ ^ \ s / =>这个正则表达式匹配$行中的空格,但不仅仅是在开头。

我也尝试写一个简单的但它也不起作用:

perl -pe 's/$\n^\s//' myfile

3 个答案:

答案 0 :(得分:1)

例如这样?

while (<DATA>) {
    chomp;
    print "\n" if /=/ and $. - 1; # do not insert empty line before the 1st line
    s/^\s+//;                     # remove leading whitespace
    print;
}
print "\n";                       # newline after the last line

__DATA__
firstname=John
name=Smith
address=Som
 ewhere

答案 1 :(得分:1)

你似乎做了太多工作。我这样做:

my $full_line;
foreach my $line (@fileIN) {
    if ($line =~ /^\s+(.+)\Z/s){                   # if it is continuation
            my $continue = $1;                     # capture and
            $full_line =~ s/[\r\n]*\Z/$continue/s; # insert it instead last linebreak
    } else {                                       # if not
            if(defined $full_line){ print $full_line } # print last assembled line if any
            $full_line = $line;                    # and start assembling new
    }
}
if(defined $full_line){ print $full_line }         # when done, print last assembled line if any

答案 2 :(得分:0)

仅检查我的解决方案1 ​​regexp:)

my $heredoc = <<END;
firstname=John
name=Smith
address=Som
 ewhere
END

$heredoc =~ s/(?:\n\s(\w+))/$1/sg;
print "$heredoc";`