Reg ex parse - URGENT PLEASE!

[chiragpatel_1]

I have a postcode column which goes like this:

AB21

G51

G5

CW9

 I want to parse a new column in which there should be only be letters letters of that postcode, I have one below but it's only returning single letter and nulls,

please help

Thank you 

[Martyn · Accepted solution]

Try a formula with REGEX_Replace([kpostcode],"\d","")

This will strip out all numerics from your string