I know by logic box to get the output using the regular expression?

Hello

I am now only study the notion of Regexp. I had seen the best of Mr. Blus. Can I know how it works. I need this logic of the functionality of wildcards in sting matching Regexp (wildcard string Matching).
SQL> ed
Wrote file afiedt.buf
 
  1  WITH test_data AS (
  2  SELECT 'c:\temp\folderA\fileA.txt' t FROM DUAL UNION ALL
  3  SELECT 'c:\temp\fileA.txt' t FROM DUAL UNION ALL
  4  SELECT '\\mymachine\A\fileB.txt' t FROM DUAL UNION ALL
  5  SELECT '\\mymachine\A\B\fileB.txt' t FROM DUAL UNION ALL
  6  SELECT '\\mymachine\A\B\C\image.jpg' t FROM DUAL UNION ALL
  7  SELECT '\\mymachine\A\B\C\D\music.mpg' t FROM DUAL UNION ALL
  8  SELECT 'c:\myfolder\folderD\folderE\4969-A.txt' t FROM DUAL
  9  )
 10  select regexp_replace(t, '^.*[\]([^\]*)[\][^\]*$','\1')
 11* from test_data
SQL> / 
 
REGEXP_REPLACE(T,'^.*[\]([^\]*)[\][^\]*$','\1')
------------------------------------------------------------------
folderA
temp
A
B
C
D
folderE
 
7 rows selected.
 
SQL>
Please help me in this matter.

Iqbal

Sabrina wrote:
One last question what is the average of

The final "\1" in

 select regexp_replace(t, '^.*[\]([^\]*)[\][^\]*$','\1') 

Iqbal

It is a reference.

See here:
http://download.Oracle.com/docs/CD/B19306_01/AppDev.102/b14251/adfns_regexp.htm#CHDHCIGH

and in the middle of the table here:
http://download.Oracle.com/docs/CD/B19306_01/AppDev.102/b14251/adfns_regexp.htm#CHDIEGEI

Matches the nth previous subexpression, in other words, either grouped in parentheses, where n is an integer between 1 and 9. The parentheses cause > an expression be remembered; a backreference refers to him. A backreference account subexpressions from left to right, starting with the opening > bracket of each subexpression preceding. The expression is not valid if the source string contains less than n subexpressions preceding the \n.

Oracle supports the expression of backreference in the regular expression pattern and the replacement of the REGEXP_REPLACE function string.
The expression (abc: def) matches the strings abcxyabc and defxydef xy\1, but does not abcxydef or abcxy.

A backreference allows you to search for a string repeated without knowing the actual string advance. For example, the expression ^(.*) \1$ > matches a line consisting of two adjacent instances of the same string.

As explained in table 4-2, backreferences store sub-expressions matched in a temporary buffer, which allows to reposition the characters. You access the pads with the notation \n, where \n is a number between 1 and 9. Each subexpression brackets and is numbered from left to right.

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