Etienne Vermaas wrote:
>
> Hi all,
Hello,
> A check to see if a pathname is "relative" or complete in some of the shell
> scripts works (seems to work)
> but I am not clear about the ?! part in the expresion, and also it seems
> that they do go together, because leaving either the ? or the ! out screw up
> the results.
> I'll appreciat your help in getting to understand this
The perlre.pod document describes (?!...), (?=...) and other regular
expression Extended Patterns.
perldoc perlre
> $ perl -n -e '
> chomp;
> if (m/^(?!\/)/) {
> print;
> print " is a relative dir ..\n"
> } else {
> print;
> print " is a full dir\n"
> } ' < in.txt
This could also be written as:
perl -nle'
if ( m|^/| ) {
print "$_ is a full dir"
} else {
print "$_ is a relative dir .."
}' < in.txt
John
--
use Perl;
program
fulfillment
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