preg_replace

[zingbats]

Hey guys,

If I have a general regex pattern such as '/([a-x])([a-z])/'...

Is it possible to have a replacement dependant on the back reference?
Or to do an individual replacement depending on the number of the match found?

For example: if \1 was "sausage", then replacement had to be "noodle", but if \1 was "noodle", the replacement had to be "pie".

How ineffective is it to a preg_replace with patterns for each individual case of the back references?

Thanks!

[Weedpacket]

Using [man]preg_replace_callback[/man] you can execute arbitrary code to decide what the replacement text should be.