Re^2: Interpolating strings within strings

Replies are listed 'Best First'.
Re^3: Interpolating strings within strings by ikegami (Patriarch) on Sep 29, 2004 at 17:44 UTC
If your variables are in a hash, the following doesn't compile the string at runtime. It's safer and possibly faster. I've even added an esacpe sequence (`${$}`) in case you need to use `$`! `%vars = ( FTPPath => '/my/ftp/path', TransferMode => 'ASCII', ); s/(\$(\w+\|{(\$\|\w+)}))/ my $var = defined($3) ? $3 : $2; $var eq '$' ? '$' : (defined($vars{$var}) ? $vars{$var} : $1); /eg;` [download] Test code: Read more... (722 Bytes)	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: Interpolating strings within strings
by ikegami (Patriarch) on Sep 29, 2004 at 17:44 UTC

If your variables are in a hash, the following doesn't compile the string at runtime. It's safer and possibly faster. I've even added an esacpe sequence (${$}) in case you need to use $!

%vars = (
   FTPPath      => '/my/ftp/path',
   TransferMode => 'ASCII',
);

s/(\$(\w+|{(\$|\w+)}))/
   my $var = defined($3) ? $3 : $2;
   $var eq '$' ? '$' : (defined($vars{$var}) ? $vars{$var} : $1);
/eg;
[download]

Test code: