Regex: Alternation in lookbehind group

Hello,
when i use an expression with an alternation, then i expect that the first matching expression will be taken and all others ignored. this is what java does normally (in my experience until now always).
Ok now i try this in a lookbehind group. I have the following expression:
(?<=(Hello World|World))\s\d{4}And the following text:
Hello World 2000Now I expect, that group #1 will return "Hello World", which is the first matching option in the alternation. But i get just "World". It seems that the engine always finds the shortest matching option. Maybe this is a bug (I'm using Java 6)?
My Problem is, I need the longest matching option. Any idea, how this could be done in a lookbehind group?
Thanks!

tm001 wrote:
Hello,
when i use an expression with an alternation, then i expect that the first matching expression will be taken and all others ignored. this is what java does normally (in my experience until now always).
Ok now i try this in a lookbehind group. I have the following expression:
(?<=(Hello World|World))\s\d{4}And the following text:
Hello World 2000Now I expect, that group #1 will return "Hello World", which is the first matching option in the alternation. But i get just "World". It seems that the engine always finds the shortest matching option. Maybe this is a bug (I'm using Java 6)?
My Problem is, I need the longest matching option. Any idea, how this could be done in a lookbehind group?
Thanks!I don't understand why you need the alternation as you have it. You are asking the engine to look back, one character at a time, from \s\d{4} for "Hello World" or "World". This means "World" will always be found first. The engine has no reason to keep looking for other matches because it already found something your expression says is acceptable. Seems reasonable to me. Where does it say the engine must match the longest string in an alternation? How did you come to form this expectation.

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Message was edited by:
MagnusGJ
Message was edited by:
MagnusGJ

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Regex: Alternation in lookbehind group

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