replace last ocurrence

[ToonMariner]

OK I got writers block...

I know this is easy.

have a string of a full path to a file want to replace the last '/' with '/thumb/'

sure i can user just str_replace for this but i just can't think

PS please sympatize! I did the Great North Run yesterday!!!!

[effigy]

The[tt] .+ [/tt] is greedy and gobbles everything. The engine then gives everything back until it finds a / (which would be the last one).
[code]
$string = '/path/to/image/dir/';
echo preg_replace('%(.+)/%', '\1/thumb/', $string);
[/code]

[obsidian]

[quote author=effigy link=topic=110239.msg445316#msg445316 date=1159803770]
The[tt] .+ [/tt] is greedy and gobbles everything. The engine then gives everything back until it finds a / (which would be the last one).
[code]
$string = '/path/to/image/dir/';
echo preg_replace('%(.+)/%', '\1/thumb/', $string);
[/code]
[/quote]

with that being said, do you think it would be safer to use [tt].*[/tt] in case you're matching a root level directory?
[code]
<?php
$string = '/';
echo preg_replace('|(.*)/|', '\1/thumb/', $string);
?>
[/code]

[effigy]

Good catch.

[obsidian]

[quote author=effigy link=topic=110239.msg445409#msg445409 date=1159809933]
Good catch.
[/quote]

thanks... not often i have one of those with regex ;)

[Nicklas]

you want to replace the last / of your path to /thumb/ ?

why dont you just [b]thumb/[/b] to the end of the path?
[code]$string = '/path/to/image/dir/';
echo $string . 'thumb/'; // ouput: /path/to/image/dir/thumb/[/code]

[obsidian]

[quote author=Nicklas link=topic=110239.msg445494#msg445494 date=1159814971]
you want to replace the last / of your path to /thumb/ ?

why dont you just [b]thumb/[/b] to the end of the path?
[code]$string = '/path/to/image/dir/';
echo $string . 'thumb/'; // ouput: /path/to/image/dir/thumb/[/code]
[/quote]

because your path may be referring to a specific file. for instance, if you grab the current URL and based on the location of the current file, you want to get the thumbnail directory, you'd want to start with the last slash, NOT with the end of the string. there are several instances where you'd want to use a check such as the regex that effigy provided as opposed to making assumptions that the path is always going to end with '/'

[ToonMariner]

Thank you. My brain is still not back on track!! ;)