preg help

[system7designs]

I don't know preg's that well, can anyone tell me how to write a
regular expression that will select everything BUT files/folders that
begin with ._ or __?(that's period-underscore and underscore
underscore)

[Justin Koivisto]

sy************@ gmail.com wrote:

I don't know preg's that well, can anyone tell me how to write a
regular expression that will select everything BUT files/folders that
begin with ._ or __?(that's period-underscore and underscore
underscore)

if(!preg_match( '`^(\._|__)`',$ filename)){
// filename does not start with "._" or "__"
}

You don't need regular expressions for this, as you could do something like:

$s=substr($file name,0,2);
if($s!='._' && $s!='__'){
// filename does not start with "._" or "__"
}

--
Justin Koivisto, ZCE - ju****@koivi.co m
http://koivi.com

[system7designs]

True, but I am using a function that processes zip files and it can
take a regular expression as an argument. So in this case I am limited
to a reg expression

[Justin Koivisto]

sy************@ gmail.com wrote:

True, but I am using a function that processes zip files and it can
take a regular expression as an argument. So in this case I am limited
to a reg expression

So do you need a negative look-ahead expression, or will the one I
posted earlier fit your need?

--
Justin Koivisto, ZCE - ju****@koivi.co m
http://koivi.com

[Mladen Gogala]

On Thu, 13 Oct 2005 05:34:22 -0700, sy************@ gmail.com wrote:

I don't know preg's that well, can anyone tell me how to write a
regular expression that will select everything BUT files/folders that
begin with ._ or __?(that's period-underscore and underscore
underscore)

This is probably what you want:

<?php
$patt='/^[^_.][^-]?/';
$str=array("._t est","__test"," _test","test"," _",".","A");
foreach ($str as $i) {
if (preg_match($pa tt,$i)) {
print "Term $i matches pattern $patt\n";
} else print "Term $i doesn\'t match pattern $patt\n";
}
?>

When executed, it produces the following:

Term ._test doesn\'t match pattern /^[^_.][^-]?/
Term __test doesn\'t match pattern /^[^_.][^-]?/
Term _test doesn\'t match pattern /^[^_.][^-]?/
Term test matches pattern /^[^_.][^-]?/
Term _ doesn\'t match pattern /^[^_.][^-]?/
Term . doesn\'t match pattern /^[^_.][^-]?/
Term A matches pattern /^[^_.][^-]?/
--
http://www.mgogala.com