Letters the first letter of sentence

Hi all

I use 10g Enterprise Edition Release 10.2.0.5.0

I would like to convert this string:

it's a phrase one another... yet another.

This is a sentence. Another... Umpteenth.

with capital letters at the beginning of the text and after any point (just looking at full stops at the moment).

I'm having a problem with regular expressions in this functions applied to the backreferences are applied for the literal text rather than the back reference.

for example:

Wrote file afiedt.buf

  1  with t as (select lower('this is a sentence. another one... yet another.') txt
  2               from dual)
  3       select regexp_replace(txt,'(\.+ +)([[:alpha:]])','\1'||upper('\2'))
  4*      from t
13:13:36 SQL> /

REGEXP_REPLACE(TXT,'(\.++)([[:ALPHA:]])','\1'||UPPER('\2'))
-------------------------------------------------------------------------------------
this is a sentence. another one... yet another.

1 row selected.

This does not succeed the upper() function is applied to the string literal "\2" rather than the appropriate alpha character.

I'm really hoping to avoid resorting to splitting the string using instr and re - concatenate together again, but what it really takes.

Yes, I Googled, but I had trouble finding references that refer to initcaps()

I'm very frustrated that I can't seem to figure it out myself. any help?

in case anyone cares, last night, when I was at Midway through a glass of single malt, I wrote the following frustration, making what I want:

SQL> with t as (select 'this is my lowercase sentence. it looks... bad.' txt from dual)
  2  select replace(sys_connect_by_path(let,'~'),'~') sentance
  3    from (
  4          select lvl
  5                ,letter
  6                ,decode(lag(fsind) over (order by lvl)
  7                        ,'1'
  8                        ,upper(letter)
  9                        ,letter
 10                      ) let
 11           from (
 12                 select lvl
 13                       ,letter
 14                       ,last_value(fs ignore nulls) over (order by lvl range unbounded preceding)
 fsind
 15                    from (
 16                 select level lvl
 17                       ,decode(level
 18                              ,1,upper(substr(txt,level,1))
 19                              ,substr(txt,level,1)) letter
 20                       ,case when substr(txt,level,1) = '.'
 21                                   then 1
 22                             when regexp_instr(substr(txt,level,1),'[[:alpha:]]') = 1
 23                                   then 0
 24                             else
 25                                  null
 26                       end fs
 27                   from t
 28                   connect by level <= length(txt))
 29                  )
 30        )
 31   where connect_by_isleaf = 1
 32   start with lvl = 1
 33   connect by lvl = prior lvl + 1
 34  /

SENTENCE
----------------------------------------------------------------------------------------------------
This is my lowercase sentence. It looks... Bad.

1 row selected.

Hello

It's the kind of thing I would write a PL/SQL function.

If you know a substring that never happens in the text (say "~"), then you can:
(1) change all spaces to ' ~ 0'
(2) when there is a number of consecutive ' ~ 0 after an end of sentence punctuation, then change the last of them in a space
(3) use INITCAP
(4) change others ' ~ 0 in spaces

SELECT     REPLACE ( INITCAP ( REGEXP_REPLACE ( REPLACE ( txt
                                   , ' '
                                   , '~0'
                                   )
                            , '([.?!](~0)*~0)([[:alpha:]])'
                            , '\1 \3'
                            )
                 )
          , '~0'
          , ' '
          )          AS cap_txt
FROM     t
;

I don't know how you can manage abbreviations, for example "example."

Tags: Database

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Letters the first letter of sentence

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