Raj wrote:
>
> Hello All,
Hello,
> I have read modifier /o is used to compile the regexp only
> once. But I don't know how it affects regular expression practically.
>
> Can anyone explain about /o modifier with examples?
The /o modifier is used when you have a variable in a regular
expression.
$ perl -e'
$_ = q[abcdefa];
print "without /o:";
$regexp = q[a];
while ( /($regexp)/g ) { print " $1"; $regexp++ }
print "\nwith /o:";
$regexp = q[a];
while ( /($regexp)/og ) { print " $1"; $regexp++ }
print "\n";
'
without /o: a b c d e f
with /o: a a
With the /o modifier, even though the variable is modified in the loop,
the regular expression retains the original compiled value.
John
--
use Perl;
program
fulfillment
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