RegExp associated


Hello

I'm new to regular expressions and I learn the techniques, can help me by telling more about branch reset the group in regex with some examples.

From what I can understand of their article, it's something like that...

Oracle: -.

(?| ABC | ((d) (e) (f) | g (h) i)
|      \_/\_/\_/  \_/
|       |  |  |    |
|       |  |  |    \--backreference 5
|       |  |  |
|       |  |  \--backreference 4
|       |  |
|       |  \--backreference 3
|       |
|       \--backreference 2
|
|
\--------------------/
|
backreference 1

Perl with branch Reset group: -.

(?| ABC | ((d) (e) (f) | g (h) i)
\_/\_/\_/  \_/
|  |  |    |
|  |  |    \--backreference 1
|  |  |
|  |  \--backreference 3
|  |
|  \--backreference 2
|
\--backreference 1

Thus, the difference with the direction General Reset group is that each condition "OR" in the expression returns the backreferences 1, matches any group of GOLD allows the first element of backreferenced within this group to be named backreference 1, the second backreference as 2 and so on.

In existing features of regexp in Oracle, it is one of the common problems (and probably why this feature has been introduced, but not in 11g as far as I can tell), each hook opening just increments the backreference, regardless of what group of GOLD, there is within the.  Which can make it very difficult to have a singular expression or matches, where you can reference the correct backreferences when you for example a regexp_replace.   The other problem with the current functionality is that the backreferences are limited of numbers from 1 to 9, so often we end up resulting using several RegExp functions to achieve what we want.  This new feature will definitely help (if oracle implement) as back-references are better interpreted and delivered to zero for each group.

Tags: Database

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