10 okt 2006 kl. 19.25 skrev Roman Neuhauser:
# frank.arensmeier@xxxxxxxxxxxxxxxxx / 2006-10-09 22:01:34 +0200:
Thank you Ilaria and Roman for your input. I did not know that preg
is able to deal with PCRE patterns.
"preg" is obviously short for "Perl REGular expressions", while
PCRE positively means Perl-Compatible Regular Expressions.
The regexp syntax from Perl is a superset of POSIX "extended"
regexps, so anything ereg_ function accept will be good for
preg_ as well (but beware of pattern delimiters).
Thanks for the info. I didn't know that.
As a matter of fact I came up
with the following solution (if someone is interested):
What problem does it solve? I mean, why are you trying to avoid
preg_replace_callback() in the first place?
Maybe because I didn't know better? Initially, I was using
ereg_replace for replacing metric numbers with imperial ones. But
obviously, ereg_replace replaces all instances in the given text
string. A text containing more than one instance of the same unit,
was replaced by the calculated replacement string of the first
finding. So I had to think about other ways to do this - which
brought me to preg_replace_callback (as I already said - I didn't
know that preg takes POSIX patterns as well).
Would you suggest a different way? Would it be faster to do the
replacement with preg_replace_callback compared to the function I wrote?
A page like this one: http://www.nikehydraulics.com/products/
product_chooser_gb.php?productMaingroup=5&productSubgroup=33
.. gets converted within 0.32 / 0.34 seconds which I think is quite ok.
/frank
the function takes a text and an array with converters like:
$converters[] = array ( "metric" => "mm", "imperial" => "in",
"ratio" => 0.039370079, "round" => 1 );
$converters[] = array ( "metric" => "m", "imperial" => "ft", "ratio"
=> 3.280839895, "round" => 1 );
function convertTextString ( $text, $convertTable )
{
# this function takes a text string, searches for numbers to
convert, convert those numbers and returns
# the complete text again.
if ( !ereg ( "[[:digit:]]", $text ) ) // if the text does not
contain any numbers, return the text as it is
{
return $text;
}
foreach ( $convertTable as $convertKey => $convertUnit )
{
$pattern =
"((\d{1,10}[,|.]*\d{0,10})*(\s)(%s)([$|\s|.|,|\)|/]+| $))"; //
this regex
looks for a number followed by white space, followed by the
metric unit,
followed by a closing character like ".", "," or ")"
$pattern = sprintf ( $pattern, $convertUnit['metric'] );
while ( preg_match ( $pattern, $text, $matches ) )
{
$matches[1] = str_replace ( ",", ".", $matches[1] );
// in case numbers are written like "6,6 m", we need to
replace "," with
"."
// because we do not want to return 0, we have to
make shure that the new value is not zero.
$itterator = 0;
do {
$value = round ( ( $matches[1] *
$convertUnit['ratio'] ), $convertUnit['round'] + $itterator );
++$itterator;
} while ( $value == 0 || $itterator == 10 );
$replacement = $value . "$2" .
$convertUnit['imperial'] . "$4";
$text = preg_replace ( $pattern, $replacement,
$text, 1 );
}
}
return $text;
}
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