John W. Krahn wrote:
>
Gauthier, Dave wrote:
>>
Getting unwanted list elements when using split with regex. Here's an
example....
$str = "abc=In";
@arr = split(/[a-zA-Z0-9]/,$str);
foreach $a (@arr)
{print "$a\n";}
I get...
<>
<>
<>
<=>
If I change "abc=In" to "abcdef=In", I get 6 unwanetd null elements (one
per char before the "=").
I was expectiing a single element list with arr[0] = "=".
What's Up ? Is ther a clen way to prevent creating these unwanted
elements?
In your example the string "abc=In" is being split using the expression
/[a-zA-Z0-9]/. That expression matches in the string at positions 0, 1, 2, 4
and 5 therefore split will produce a list of *six* elements:
$ perl -le'
$str = "abc=In";
print ++$x, ": <$_>" for split /[a-zA-Z0-9]/, $str, -1;
'
1: <>
2: <>
3: <>
4: <=>
5: <>
6: <>
Your example only shows four because split automatically discards any trailing
empty elements.
[snip]
Er, but he shows /six/ elements; and split /doesn't/ discard trailing empty
elements. Or am I misunderstanding you John?
Rob
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
http://learn.perl.org/
