will1383
asked on
How do I approach this?
I am working on a small project (which will expand) in order to learn how to user Perl. I have prior software experience so I understand all of the usual methodologies but I do not understand how to make the most efficient use of Perl's powerful features. This is the beginning of this adventure. I hope you can help.
Here's the start:
I have a filename that looks like the following: Server01__NEWFIRST.2005.02
The date/timestamp in that name is as follows: yyyy.mm.dd.hh.mm
From that I want to create this:
2-14-2005
Now how in the world do I perform this using the regular expressions? I have the Perl 5 by example book in softcopy and I have been reading through the regular expression stuff but I still do not understand how to apply as there are very few examples.
Any help in educating me is greatly appreciated. A solution is great, but I would like help in learning how the solution comes about.
Thanks in advance.
Here's the start:
I have a filename that looks like the following: Server01__NEWFIRST.2005.02
The date/timestamp in that name is as follows: yyyy.mm.dd.hh.mm
From that I want to create this:
2-14-2005
Now how in the world do I perform this using the regular expressions? I have the Perl 5 by example book in softcopy and I have been reading through the regular expression stuff but I still do not understand how to apply as there are very few examples.
Any help in educating me is greatly appreciated. A solution is great, but I would like help in learning how the solution comes about.
Thanks in advance.
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hi will1383. hope this has helped you.
ASKER
yes it has sorry. I haven't had a chance to come back.
I'm still trying to understand how the regular expressions work. This is a good start.
They seem quite complicated on the surface due to their lack of readability.
I'm still trying to understand how the regular expressions work. This is a good start.
They seem quite complicated on the surface due to their lack of readability.
yes they can appear a bit cryptic. If yopu use the x option, you can embed comments in the regex to make it more redable.
$str =~ /
^.* # start with any characters
(\d{4}) # then 4 digits, capture in $1
\. # then literal dot, backslash delimits
(\d{2}) # then 2 digits
\. # then a dot
(\d{2}) # then 2 digits
/x;
$str =~ /
^.* # start with any characters
(\d{4}) # then 4 digits, capture in $1
\. # then literal dot, backslash delimits
(\d{2}) # then 2 digits
\. # then a dot
(\d{2}) # then 2 digits
/x;
ASKER
ooo that's a great little option there. Thank you for that tip. I know I'm going to be bugging you guys quite a bit more so I can work on my regular expression education.
I appreciate it mucho.
I appreciate it mucho.
$str = "Server01__NEWFIRST.2005.0
$str =~ /^.*(\d{4})\.(\d{2})\.(\d{
$year = $1;
$month = $2;
$month = sprintf("%d",$month);
$day = $3;
$new_str = "$month\-$day\-$year";
print $new_str;