Help in extracting particular lines in a file

[Clarisa]

Hello Folks

I am working on extracting lines

of data in a text file based

on the string it contains.

This is the text file called info.txt:

701,apple,red,r ound,cider
214,car,pink,sp orty,cute,
229,knife,silve r,sharp,cut


The program i am working on asks for input from a user .
Thus if the user enters 214 the program
then matches the number to a particular line ( in the text file ) starting with that number (in this case the second line)
and prints out everything on only that particular line.


And this is the program
i have so far

print "type your number";
$num=<STDIN>;
chomp($num);


open (DAT, 'info.txt') || die "file not opened";
@line=<DAT>;

foreach (@line)
{
chomp;

if ($_=~ m/^$num/)
{
print "$_\n";
}
}
close (DAT);



I am learning perl as my first programming language and
any help will be appreciated

Thanks in advance.

[KevinADC]

Do you need to turn your homework in tomorrow?

See the other forum where you have ths posted.

[numberwhun]

Hello Folks

I am working on extracting lines

of data in a text file based

on the string it contains.

This is the text file called info.txt:

701,apple,red,r ound,cider
214,car,pink,sp orty,cute,
229,knife,silve r,sharp,cut


The program i am working on asks for input from a user .
Thus if the user enters 214 the program
then matches the number to a particular line ( in the text file ) starting with that number (in this case the second line)
and prints out everything on only that particular line.


And this is the program
i have so far

print "type your number";
$num=<STDIN>;
chomp($num);


open (DAT, 'info.txt') || die "file not opened";
@line=<DAT>;

foreach (@line)
{
chomp;

if ($_=~ m/^$num/)
{
print "$_\n";
}
}
close (DAT);



I am learning perl as my first programming language and
any help will be appreciated

Thanks in advance.

I am not sure which other forum you posted this to (thanks for the heads up Kevin), but hopefully they guided you correctly.

What I see is that you are trying to use a variable in a Regular Expression and that is not possible. Variable Interpolation does not happen in a regex match. You have to produce a regex that would match the data you are trying to identify. The regex isn't that bad and shouldn't be to hard to figure out. Why not try and write an appropriate regex and if you are still having issues, repost here for more assistance. Be sure not to keep cross posting between different forums as a number of us do lurk/post to other forums as well ( as you found out).

Regards,

Jeff

[KevinADC]

he/she is getting help on the other forum.