Find and Replace using Notepad++

Question

I'm trying to use Notepad++ to do some find and replace as I'm dealing with up to few thousand of lines of data.

The below is the example of the data structure that i am dealing with.

A = Can be any Aplabet
X = Can be any Number 0-9
RX = Number that I want to replace with another value.

AAAAA X.XXXXXX X.XXXXX X X X X X XX:XX:XX:XX.XXX XXX RXRXRXRXRXRX XXXXXX XXXXXX

Actual Example

werwer 2.178924  1.17892  1 1 1 1 1   12:14:44:59.123  123  0123123  123345  123123
gret   2.178975  1.15731  1 1 1 1 1   12:14:44:59.123  123  0123     123345  123123
sdfwe  2.123245  1.15171  1 1 1 1 1   12:14:44:59.123  123  0555312  123345  123123

Is there a shortcut I can use?

Answer 1

As you've set the regex tag, I'll post two relevant ones here.

First one matches the end of your pattern exactly:

^(.+ )[0-9]{6}( [0-9]{6} [0-9]{6})$

And the second one ignores exact lengthes of the fields and just ensures that they are numerical and in correct positions:

^(.+ )[0-9]+( [0-9]+ [0-9]+)$

The replace string would be \1CHANGEDNUMBER\2.

Hope that helps you more than an answer with shortcuts everyone knows.