Replace last slash in string php

Question

I have a hard time getting around regular expressions and I'm trying to remove the last forward slash in a string :

$public_url = "https://api.mongohq.com/";

What I intend is remove the last forward slash and replace it with something else. I figured I could use preg_replace but I cannot find the right pattern for doing it.

rtrim($public_url,'/'); http://ca3.php.net/manual/en/function.rtrim.php — Jon Hulka
– Jon Hulka, Commented Jan 27, 2013 at 10:17
@JonHulka ~ I was looking for a regex so I can replace with something rather than adding at the end of string :) — Roland
– Roland, Commented Jan 27, 2013 at 10:19
"Some people, when confronted with a problem, think 'I know, I'll use regular expressions.' Now they have two problems." — nkr
– nkr, Commented Jan 27, 2013 at 10:28
@nkr ~ you're right :)) I never had the time to sit and learn RegEx :| I hope I will soon though — Roland
– Roland, Commented Jan 27, 2013 at 10:47

Frederik Kammer · Accepted Answer · 2013-01-27 11:28:53Z

5

You can use a negative lookafter-expression:

<?php
$public_url = "https://api.mongohq.com/";
$replace = "foobar";

echo preg_replace("~\/(?!.*\/)~", $replace, $public_url);
?>

Output:
https://api.mongohq.comfoobar

Update:
Use the following regex to avoid problems with characters behind the last slash:

echo preg_replace("~\/(?!.*\/)(.*)~", $replace, $public_url);

All characters behind the last slash are replaced, too. Thanks to knittl!

edited Jan 27, 2013 at 11:28

answered Jan 27, 2013 at 10:22

Frederik Kammer

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4 Comments

Frederik Kammer Over a year ago

BTW: The question was already answered: stackoverflow.com/questions/7790761/…

knittl Over a year ago

This will also match https://api.mongohq.com/abc – not sure if that is the anticipated behavior: codepad.org/OvUFHdU8

Frederik Kammer Over a year ago

Thanks for your comment. I updated my answer so that all characters behind the slash will be replaced, too

knittl Over a year ago

@Freeddy: I'm still not sure this is what the OP wants. But the question is not phrased 100 % correct and your answer got accepted, so maybe I'm assuming something wrong.

knittl · Accepted Answer · 2013-01-27 10:22:13Z

5

$ anchors regular expression patterns at the end of the string:

$public_url = preg_replace('#/$#', 'replace it!', $public_url);

Also possible:

$public_url = rtrim($public_url, '/').'replace it!';

answered Jan 27, 2013 at 10:22

knittl

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2 Comments

Roland Over a year ago

This is what I get :

preg_replace(): Unknown modifier '$' in C:\Users\rgr\Apache\htdocs\Roland Groza [ 3.0 ]\class\mongohq\mongohq.php on line 230

knittl Over a year ago

@Roland: It works for me. I don't get that error (with or without trailing slash): codepad.org/UMD5xpgA

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