Is it possible to remove 2nd or 3rd occurence of some string

[marino]

Hi
1) For example how to remove/replace 3rd occurence of ":" with "xx"
aaaa:bbbb:cccc:dddd:eeee - it means between cccc and dddd - of course words will not have the same lenght.
2) how to remove dddd and replace it with lets say xxxxxxxxx - the point is to replace something after 3rd ":" not to search for dddd because I want to replace all words after 3rd ":" but before 4th ":"in all lines.
I am interesting only how to do it with regular expressions if possible
Thank You very much.

[Mofi]

Regular expressions in UltraEdit style!

1) Search for %^(*:*:*^): and replace it with ^1??.
?? is simply nothing, if you want to remove the 3rd ':', or "xx", if you want to replace it.

2) Search for %^(*:*:*:^)*: and replace it with ^1??:.
?? is the new word.

[marino]

Thanks