On 2/9/2007 9:48 AM, Andrew Lentvorski wrote:
John H. Robinson, IV wrote:
Andrew Lentvorski wrote:
Also, Perl needs to suck it up and put named groups in its regex engine.
What is the benefit of:
(?P<id>[a-zA-Z_]\w*) m.group('id')
over
([a-zA-Z_]\w*) $1
?
Why do so many Perl subroutines use named parameters rather than
positional parameters?
Code maintenance.
Take a recursive descent parser, for instance. If I need to add another
token in the middle or adjust the grammar rules, the tokens all
rearrange which positional group they fall into.
Also the fact that $1, $2, etc. change value (or undef) when the next
regex is run.
Karl
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