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

 


Zippy1970
Novice

Mar 4, 2013, 5:00 AM

Post #1 of 3 (17760 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 (17756 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 (17746 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. :)

 
 


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