RegEx: How to find out which part of the pattern failed?

Hi there,
I was wondering: is there any way to find out where the pattern matching failed?
Say I got the string "John Paul Yoko Ringo", and I want to match it against the pattern /John Paul George Ringo/.
I would like to know something like "pattern failed at index 11", or if I had groups something like "matching group 3 failed".
Is there any way to do this? Thanks in advance!
Best regards,
- Torben

jschell wrote:
I would like to know something like "pattern failed at index 11", or if I had groups something like "matching group 3 failed".
Is there any way to do this? Thanks in advance!
I wonder if that is reasonable. It means that the parse tree for the regex would need to keep mapping information.
At a minimum it is going to require an array, not a single result, because a regex can 'fail' in many ways.
Consider the following regex with the following input
/(a|b)d/
abababababx
Where does it 'fail'?Right. If you just want the character position at which it failed, those tools might tell you that as part of a bigger picture. But by itself, without any context, that number's not necessarily meaingful. A given character can be examined many times due to backtracking. Part of the expression could succeed for part of the input, then the expression might fail for the rest, so we backtrack, and may get several more failures, then more partial successes, all at different points, then ultimately it may fail anywhere within the input.
So just knowing where isn't enough. You need to know what steps were taken to get there. I do think these tools provide that, though I haven't looked closely.

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Edited by: BluShadow on 17-May-2011 15:01
added {noformat}{noformat} tags around the code

833560 wrote:
Can any one give me clue ,how to find out which sub query returns more than one row in the following query .This is why smaller, simpler queries are easier to work with than huge ones - when something like this goes wrong smaller queries are much eaiser to debug. Unfortunately using smaller, easier-to-work with queries is not always an option
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