Perl: Can not print occurence of string "." from an array

Question

i have an array which contain (head , b , v , . , b, v, end).
i try to find and get the ".", and do sth after that (example: print out ).

for unknown reason i can't get the "."

so i did a simple code to count occurence of char inside the array. here's the code:

$stylefile="log2.style";
open ("styles", $stylefile) or die ("can't open file");

while (<styles>)
{
$temp = $_;
chomp($temp);
push @style,$temp;
}    
print @style;
# here is the array "headbv.bvend"

@bar = grep(/v/i, @style);
print @bar;
# it prints out vv

@fullstop = grep(/./i, @style);
# it prints out the entire array values.

any clue how to get occurences of "." ?

moonshadow · Accepted Answer · 2014-03-20 09:04:27Z

6

Use /[.]/ instead of /./ to match a full stop.

man perlre for more details.

answered Mar 20, 2014 at 9:04

moonshadow

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Lee Duhem · Accepted Answer · 2014-03-20 09:35:17Z

4

You also could use /\./ to match a full stop.

Test program:

$ perl -e ' $_ = "a.b.c"; @f = m/(\.)/g; print "@f\n" '
. .

answered Mar 20, 2014 at 9:35

Lee Duhem

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Comments

Dave Cross · Accepted Answer · 2014-03-20 11:00:03Z

1

The dot is a special character in regular expressions. It matches any character - which explains the behaviour you are seeing.

To make a special character just match itself you need to escape it with a backslash.

@fullstop = grep(/\./i, @style);

You should probably read the Perl regular expression tutorial (or reference)

answered Mar 20, 2014 at 11:00

Dave Cross

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