[phpXML] Re: [phpXML] [xpath.class.php] Question (stupid one ?)

[<nig...@us...>]

> I'm still fighting with xpath.class.php
>
> I don't buy the fact the problems I have with xpath.class.php are related
> to my ISP because xml.php 1N6 works like a charm) and I use it a lot.

Yeah, I'm not that happy with it as the reason either...

> So I'd to have a detailed explanation of the meaning of the following
error :
> phpXML error: While parsing an XPath expression there was an error in the
> predicate "Gerhard", because it was the null string. If you wish to seach
> for the empty string, you must use ''.
>
>
> Context
> ========
> xpath.class.php
>
> Line 1996
>      if (ereg('^\w*$', $predicate)) {
>        // Display an error message.
>        $this->_displayError("While parsing an XPath expression ".
>          "there was an error in the predicate \"$predicate\", ".
>          "because it was the null string.  If you wish to seach ".
>          "for the empty string, you must use ''.");
>        return FALSE;
>      }
>
> The error occurs when I try to use xpath.class.php  with government
example
> in this case searching for Gerhard::
>
> phpXML error: While parsing an XPath expression there was an error in the
> predicate "Gerhard", because it was the null string. If you wish to seach
> for the empty string, you must use ''.
>
> Question
> ===========
> How can the string "Gerhard" be a "null string" ???

I only know how to use perl regexes, and have still not found a decent POSIX
reference despite 1 hour of searching the other day.  Run the following
script:

<?php

echo "With 'Gehard'<br>\n";
echo 'result from ereg (using POSIX regexes) is:'.(ereg('^\w$',"Gerhard") ?
"true" : "false")."<br>\n";
echo 'result from preg_match (using PERL regexes)
is:'.(preg_match("/^\s*$/", "Gerhard") ? "true" : "false")."<br>\n";

echo "With ''<br>\n";
echo 'result from ereg (using POSIX regexes) is:'.(ereg('^\w$',"") ? "true"
: "false")."<br>\n";
echo 'result from preg_match (using PERL regexes)
is:'.(preg_match("/^\s*$/", "") ? "true" : "false")."<br>\n";

?>

I get an output of:

    With 'Gehard'
    result from ereg (using POSIX regexes) is:false
    result from preg_match (using PERL regexes) is:false
    With ''
    result from ereg (using POSIX regexes) is:false
    result from preg_match (using PERL regexes) is:true

Which shows to me that the regex is wrong.  So change this line:
     if (ereg('^\w*$', $predicate)) {
to:
    if (preg_match("/^\s*$/, $predicate)) {

And let us all know if it works.

Nigel


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