Re^3: Stupid question about regex with string followed variable in replacement

In the spirit of TIMTOWTDI, you could also disable metacharacter processing using "\Q..\E":

my $txt = '1,2';
$txt=~ s/(\d+)\,(\d+)/$1\Q0\E,$2/;
[download]

This converts the "1" to "10".

Unfortunately, simply escaping like "\0" does not work for many cases, because many escape sequences have special meaning .. Eg: \0 starts an octal sequence. See "perldoc perlrebackslash"

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-- Dr. Cox, Scrubs

Comment on Re^3: Stupid question about regex with string followed variable in replacement Download Code

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Re^4: Stupid question about regex with string followed variable in replacement by LanX (Saint) on May 20, 2013 at 00:37 UTC
In this case I wouldn't use '\Q' at all, since it has an effect while '\E' is quite neutral! `DB<100> $var=666 => 666 DB<101> "$var\Efoo" => "666foo" DB<102> "$var\Ef\Eoo" => "666foo"` [download] Anyway the use case is restricted to interpolation like in qq{} or regex. Curlies can be used for any variable. Cheers Rolf ( addicted to the Perl Programming Language)	[reply] [d/l]
Re^4: Stupid question about regex with string followed variable in replacement by Anonymous Monk on May 19, 2013 at 23:21 UTC
Thank you for your reply as well :) Quite interesting way to avoid that problem. Btw, I was using escape characters before, but like you pointed it's not working for many cases, so I finally decide to ask for Perl Wisdom to do it right :)	[reply]