Perl Guru Forums: Perl Programming Help: Regular Expressions: s/// : Why doesn't this work?

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Regular Expressions:
s/// : Why doesn't this work?

Zippy1970
Novice

Mar 4, 2013, 5:00 AM

Post #1 of 3 (12003 views)

s/// : Why doesn't this work?	Can't Post

Code

my $str = '$1$'; 
my $key = '$1$ Hello World!'; 
$key =~ s/$str//; 
print "$key\n"; 
 
Output: 
 
$1$ Hello World!

As you can see, it's not removing '$1$'. This behavior is new to me. What am I missing here?

(This post was edited by Zippy1970 on Mar 4, 2013, 5:00 AM)

rovf
Veteran

Mar 4, 2013, 5:39 AM

Post #2 of 3 (11999 views)

Re: [Zippy1970] s/// : Why doesn't this work? [In reply to]	Can't Post

Because $ has a special meaning in a regexp (and as a sigil).

Use

Code

my $str = quotemeta('$1$');

instead.

Zippy1970
Novice

Mar 4, 2013, 6:56 AM

Post #3 of 3 (11989 views)

Re: [rovf] s/// : Why doesn't this work? [In reply to]	Can't Post

Right after I posted my original question, I found out this works as well:

Code

my $str = '$1$';  
my $key = '$1$ Hello World!';  
$key =~ s/\Q$str\E//;  
print "$key\n";

Which of course does the exact same thing. :)

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives