Posted by jens on 10/31/05 14:48

I was wondering if anyone could tell be whether it's possible to
instruct preg_match not to save subexpressions matches under 0, 1...n
keys when using named subexpressions; I.e instruct preg_named to
matched under their names only,
and not under their numbers. E.g. take the following example:
<pre style="width:100%;text-align:justify">
/^(?:(?:ftp|http)\:\/\/)?(?P<host>[^\/\:]*)(?:\:(?P<port>[0-9]{4}))?(?:(?P<path>\/(?:[~\%\w\.\-_]*\/)+)?(?P<file>[~\%\w\.\-_]+)(?:\?(?P<query>.*))?)?$/
</pre>
for the string
"http://groups.google.com/group/comp.lang.php/post?hl=en&_done=%2Fgroup%2Fcomp.lang.php%2Fbrowse_thread%2Fthread%2Fa56103941c7e5176%2F9b7c8045d2841990%3Fq%3Dregular+expressions+sub-expressions%26rnum%3D1%26hl%3Den%26&"
generates the following matches:

Array
(
[0] =>
http://groups.google.com/group/comp.lang.php/post?hl=en&_done=%2Fgroup%2Fcomp.lang.php%2Fbrowse_thread%2Fthread%2Fa56103941c7e5176%2F9b7c8045d2841990%3Fq%3Dregular+expressions+sub-expressions%26rnum%3D1%26hl%3Den%26&
[host] => groups.google.com
[1] => groups.google.com
[port] =>
[2] =>
[path] => /group/comp.lang.php/
[3] => /group/comp.lang.php/
[file] => post
[4] => post
[query] =>
hl=en&_done=%2Fgroup%2Fcomp.lang.php%2Fbrowse_thread%2Fthread%2Fa56103941c7e5176%2F9b7c8045d2841990%3Fq%3Dregular+expressions+sub-expressions%26rnum%3D1%26hl%3Den%26&
[5] =>
hl=en&_done=%2Fgroup%2Fcomp.lang.php%2Fbrowse_thread%2Fthread%2Fa56103941c7e5176%2F9b7c8045d2841990%3Fq%3Dregular+expressions+sub-expressions%26rnum%3D1%26hl%3Den%26&
)

Notice that all subexpressions are saved twice in the array. Can this
be avoided?

[Back to original message]