note
demerphq
<p>
I wonder... A switch could be added that would tell perl that you commit to not modifying the string before utilizing $1. Then the memcopy would be unnecessary. That way you could say
</p>
<p>
<code>
$str =~ /Hulk hate (\w+)/k;
</code>
</p>
<p>
And get the same effect. Of course the demons that would fly out of your nose if you said:
</p>
<p>
<code>
if ($str =~ /Hulk hate (\w+)/k) {
$str='demons!';
print $1; # could and probably would throw fatal error.
}
</code>
</p>
<p>
Would be your problem...
</p>
<p>
BTW, if it isnt clear, this is the reason the memcpy is needed.
</p>
<p>
Alternatively, perhaps magic could be introduced to $str so that the memcpy would only happen if $str was modified while the match vars pointed at it...
</p>
<p>
A last possibility would be to not do the memcpy if the string was RO. Then you could by hand readonly the string, do the match, use $1 and then when and if you needed to modify the string undo the RO.
</p>
<p>
I guess another variant could be that the /k would result in no copy, and an understanding that accessing $1 et all would be a fatal error while that regex was the last used. However the @- @+ arrays would be populated. Its just the user would be expected to do the substring operations by hand.
</p>
<div class="pmsig"><div class="pmsig-108447">
---<br />
$world=~s/war/peace/g<br />
<br />
</div></div>
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