Delete the 4 last digits of a message

what I am tryng to do is to delete the las 4 digits of a message and I do not how to do it for a big amount of messages. the type of messages that I have have number comas and leters but the last are numbers and always diferent. I am thinking of using this functions:

fname

Please help.

Answer 1

[KSSV]

str = 'Hello World'  

str = 'Hello World'

str(end-3:end) = []

str = 'Hello W'

[flashpode]

instead of hello word could you do it for a AIS1 that is a string of 20000x1 where every message is the following way !AIVDM,1,1,,A,13ErMfPP00P9rFpGasc>4?wn2802,0*070000

[Walter Roberson]

output = regexprep(AIS1, '\d\d\d\d$', '')

This will delete the last 4 characters provided they are digits. It does not "delete the last four digits", so it would leave "ABC12345D" unchanged, and likewise it would leave "AB123D45" unchanged where "last four digits" would require "AB1D" as output

[flashpode]

really useful thank youuu