Question

I do not not know much about Regex, I want to try parsing sting from database according to flowing instructions.
I know that I am need to use CLR but for begin I want to learn Regex

Data in tables look like

create table #tempTBL (opis varchar(40))
go
insert into #tempTBL
select 'C 136'
union 
select 'C 145'
union 
select 'C146'
union 
select 'AK C 182'
union 
select 'C  277'
union 
select 'C-240'
union 
select 'ISPRAVKA PO C 241'

And select sting looks like

Select 
     reverse(
            rtrim(
                    ltrim(
                            replace(
                                    (substring
                                            (reverse(opis)
                                                    ,0
                                                    ,charindex(
                                                                'C',reverse(opis)
                                                               )
                                            )
                                      )
                            ,'-',' ')
                          )
                  )
            ) as jci
from #tempTBL

How should looks like my C# code to I repeat this using regex

Answer 1

Rather than building a CLR assembly to apply a regex to meet this specific requirement, you might be better off building a set of general-purpose regex CLR functions.

There are many examples out there, but this article is as good a place to start as any

EDIT
If your example covers the full range of possible configurations of your data, the regex you need may be something as simple as (\d+) (meaning one or more consecutive digits returned as a match group).