Have a look at this

declare @STR varchar(100)

select @STR = '1230-544,15C5487,132DE78'

;With Breakdown as

(

Select

SubString(@Str,1,1)[Chr],

1[Idx]

Union All

Select

SubString(@Str,Idx+1,1),

Idx+1

from Breakdown

where (Idx+1)<=Len(@Str)

)

select chr from Breakdown where isnumeric(chr) = 1

Edit:- This will return ',' and '-'. You need to filter them out.