Trouble with +-sign as delimiter

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello everyone, I'm trying to use split on a line from a file that uses + sign as a delimiter. Whenever I try this, I get an error where the interpreter thinks I'm trying to use a regexp. For example, this code:


$t = "t+e+s+t";
($a, $b, $c, $d) = split ("+", $t);

Generates this error: "/+/: ?+*{} follows nothing in regexp at w.pl line 2." I'm pretty sure I need something to interpolate the +-sign because plain old quotes " " are not getting it done. Thanks, RT

Comment on Trouble with +-sign as delimiter

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Re: Trouble with +-sign as delimiter by vroom (His Eminence) on May 02, 2000 at 00:48 UTC
Try \+ instead vroom \| Tim Vroom \| vroom@cs.hope.edu	[reply]
Re: Trouble with +-sign as delimiter by btrott (Parson) on May 02, 2000 at 00:50 UTC
The PATTERN specified to split is always interpreted as a regex, even if you don't put // around it (except, I guess, for the special case of ' '--more in the split manpage). The solution is to escape the "+": `($a, $b, $c, $d) = split /\+/, $t;` [download]	[reply] [d/l]
Re: Trouble with +-sign as delimiter by perlmonkey (Hermit) on May 02, 2000 at 04:55 UTC
You can also use the \Q and \E in the regular expression to make sure charaters are interpreted literally; `$delimeter = "+"; $t = "t+e+s+t"; ($a, $b, $c, $d) = split(/\Q$delimeter\E/, $t); ### or ### ($a, $b, $c, $d) = split(/\Q+\E/, $t);` [download] But for the last one just using /\+/ is obviously easier.	[reply] [d/l]