[PHP] remove unwanted characters from a string

[icetohot]

how do I replace all characters in a string that aren't in a certain characters set (ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwzyz1234567890-_.)?

thanks

[spydoor]

don't know much PHP, but use regular expressions

ereg_replace

http://us4.php.net/regex

for your example it would be something like

ereg_replace("[^A-Za-z0-9-_.]", "", $string);

replace everything not mathced by regexp with blank

(you may have to handle the . by escaping it ?????)

[icetohot]

  spydoor said:

don't know much PHP, but use regular expressions

ereg_replace

http://us4.php.net/regex

for your example it would be something like

ereg_replace("[^A-Za-z0-9-_.]", "", $string);

replace everything not mathced by regexp with blank

(you may have to handle the  .  by escaping it ?????)

585533353[/snapback]

thanks!

I ended up using ereg_replace("[^[:alnum:]+.+_+-]", "_", $string);

:D