Perl match problem

[yezi]

If I want to find the text wheather match the RD[$j] $j is the any
number
between -25 to 25, can I write the following sentence :
for ($j=-25;$j<=25;$j++)
if($parts[0] =~ /RD[$j]/)

I am not sure the is expression, since the code can not work. Thanks
for any
comments

 

[Jürgen Exner]

If I want to find the text wheather match the RD[$j] $j is the any
number
between -25 to 25, can I write the following sentence :
for ($j=-25;$j<=25;$j++)

This is better written as
for (-25..25) {

if($parts[0] =~ /RD[$j]/)

Yuk! Why the loop?
(untested, just to give you an idea):

if (/RD(\d*)/) and $1 >= -25 and $1 <= 25) ....

jue

 

[John Bokma]

(untested, just to give you an idea):

if (/RD(\d*)/) and $1 >= -25 and $1 <= 25) ....

Uhm, since you expect at least one digit, at most 2, and there could be a
minus sign:

/RD(-?\d\d?)/

or

/RD(-?\d{1,2})/

 

[Josef Moellers]

If I want to find the text wheather match the RD[$j] $j is the any
number
between -25 to 25, can I write the following sentence :
for ($j=-25;$j<=25;$j++)
if($parts[0] =~ /RD[$j]/)

I am not sure the is expression, since the code can not work. Thanks
for any
comments

You do know that [ and ] are meta characters and must be escaped when
matched?

if ($parts[0] =~ /RD\[$j\]/)

 

[Jürgen Exner]

Uhm, since you expect at least one digit, at most 2, and there could
be a minus sign:

/RD(-?\d\d?)/

or

/RD(-?\d{1,2})/

Thanks. I also forgot the enclosing square brackets for the number, BTW.

jue

 

[yezi]

Thanks for all the posts , It is really helpful. I am new one in perl.
thanks