Re: Second Time Replace Regex

How about something like:

my $file_name = ...;

my $file;
{
   open(my $fh, '<', $file_name)
      or die("Unable to open input file: $!\n");
   local $/;
   $file = <$fh>;
}

my ($P) = $file =~ /A(.*?)B/
   or die("Unable to find 'P'\n");

$file =~ s/(C.*?)\Q$P\E/$1Q/g;

{
   open(my $fh, '>', $file_name)
      or die("Unable to open output file: $!\n");
   print $fh $file;
}
[download]

Update: Added \Q...\E.

Comment on Re: Second Time Replace Regex Select or Download Code

Replies are listed 'Best First'.
Re^2: Second Time Replace Regex by JediWizard (Deacon) on Dec 02, 2005 at 22:37 UTC
Correct me if I'm wrong but . . . My understanding is that \Q and \E would not be needed in the regex if you quotemeta $P, or vise versa (quotemeta is not needed if you use \Q .. \E). From quotemeta: quotemeta Returns the value of EXPR with all non-"word" characters backslashed. (That is, all characters not matching /A-Za-z_0-9/ will be preceded by a backslash in the returned string, regardless of any locale settings.) This is the internal function implementing the \Q escape in double-quoted strings. If EXPR is omitted, uses $_ . They say that time changes things, but you actually have to change them yourself. —Andy Warhol	[reply]
Re^3: Second Time Replace Regex by ikegami (Patriarch) on Dec 02, 2005 at 22:40 UTC
I accidently updated prematurely. You saw bad code I had there for 5s. `quotemeta` plus `\Q...\E` would indeed give incorrect results.	[reply] [d/l] [select]

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