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Compiling regular expressions once for reuse


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#1 alokito

alokito
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Posted 28 July 2006 - 11:39 PM

I need to search many (thousands) of strings with the same regular expression. Is it possible to compile the regular expression once and reuse it in php as you can in python and java and perl? for instance , here's a good perl example from http://www.perl.com/...od/perlop.html:

foreach $pattern (@pattern_list) {
        my $re = qr/$pattern/;
        foreach $line (@lines) {
            if($line =~ /$re/) {
                do_something($line);
            }
        }
    }



#2 Kris

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Posted 07 August 2006 - 11:12 AM

Like this?
<?php
$strings = array("here","are","thousands","of","strings","2006-08-07","blah","blah");
foreach($strings as $s) {
    if(ereg("([0-9]{4})-([0-9]{2})-([0-9]{2})",$s)) echo "<p>$s is in a date format.</p>";
}
?>





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