regular expression help

kender

i am trying to create a redirect script

redirect.php

what i am missing (i have it redirecting based off of ?loc= ) is the ability to have it redirect without or with the [url]http://[/url]

right now, it redirects with ?loc=http://url.com/page.html, but i cant seem to figure out the wording to get it to do both that and ?loc=url.com/page.html

so how do i get it to search for [url]http://[/url] and if not found, add it ?

rachel2004

The manual doesn't recommend preg_match() function for this (it suggest using strpos() or strstr() for something simple like this), but here it is with preg_match() as that's what I use for regex. This should get you on your way:

<?php 

$string = trim("http://www.example.com");

$pattern = "/^(http:\/\/){1}/";

if (preg_match($pattern, $string, $matches)) {
	echo "<p>Contains http prefix</p>";
} else {
	echo "<p>Needs http prefix</p>";
}

?>

kender

cant seem to get it to work

heres what i have

<?
ob_start();

$string = trim("$_GET[loc]"); 
$pattern = "/^([url]http://[/url]){1}/"; 

if (preg_match($pattern, $string, $matches)) { 

echo "http-- ".$string.""; 

} else {

echo "no http-- ".$string.""; 
//	header("Location: [url]http://[/url]".$string."");

}

?>

as you can see, i will be using header() to change the url when approved, but right now, both instances (with and without [url]http://[/url]) return as no http--

kender

lol
ignore the a href= target=blank.. i didnt enter those 😉

kender

partially resolved with

<?
ob_start();

$url = $_GET[loc]; 
$newurl = str_replace("http://", "", $url);

header("Location: [url]http://[/url]".$newurl."");

?>

works for lower case.. how can i edit this to work with all cases? [url]HTTP://[/url] [url]htTP://[/url] [url]Http://[/url] etc

robgudgeon

have a look at parse_url:

http://uk.php.net/parse_url

and str_ireplace to replace case-insensitively

rob

kender

resolved with

<?
ob_start();

$url = parse_url($_GET['loc']);

if ($url['scheme'] == '') {
	$url[scheme] = 'http';
	}

$linkfin = '?'.$url[query].'';
$linkfrag = '#'.$url[fragment].'';

if ($url['query'] == '') {
	$linkfin = '';
	}

if ($url['fragment'] == '') {
	$linkfrag = '';
	}

$link = ''.$url[scheme].'://'.$url[host].''.$url[path].'';

header("Location: ".$link."".$linkfin."".$linkfrag."");

?>

thanks for having me look into parse url - notice, if no http/ftp/https is given, then it defaults to http

dont think i want to add mailto: support but i may