PHP RegEx specifies the characters I want?

Question

How would I remove all characters from a string that does NOT contain [a-zA-Z0-9\-\/_]

:?

In other words, I would like to indicate what I want, not what I don't have. Thanks.

+2

user336063 May 18 '10 at 1:49

4 answers

try the following

preg_replace("/[^a-zA-Z0-9-\/_]/", "", $string);

+1

Josnidhin May 18 '10 at 1:53

If you want to keep "/" and "\"

preg_replace("/[^a-zA-Z0-9-\\\/_]/", '', $string);

0

Geek Num 88 May 18 '10 at 1:54

The shortest way to do it:

echo(preg_replace('~[^\w-/]~i', '', 'H#el/-l0:0.'));

Outputs:

"Hel/-l00"

0

leepowers May 18 '10 at 3:04

Jakub hampl · Accepted Answer · 2010-05-18T01:51:14+0000

The easiest way:

preg_replace("/[^a-zA-Z0-9-\/_]/", '', $string);

Another approach would be to do the match and then explode the matched values.