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The way I think it works is that the regex-engine starts by grabbing the whole of the string for the first capture and then sees that it cannot match anything anymore and thus starts "giving back" character by character to match the other elements of the regex.

As 'x' has to come in blocks of 12 elements, the regex for that variable is (o*)\1{11}, being whatever the regex-engine in trying, followed by 11 times that what is being tried for the first capture. 11 + 1 = 12, so you have your '12x'. The same goes for the other variables.

Probably inside the regex there are some shortcuts and optimizations, but basically it is just "try everything until you find a solution".

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James


In reply to Re^3: The Oldest Plays the Piano by CountZero
in thread The Oldest Plays the Piano by casiano

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    [perldigious]: A question since I'm ignorant of what's normal for database management... Do admins change column names a lot in databases?
    [perldigious]: On occasion my scripts break, because they will do something that seems laregly pointless to me... like in this case, changing a column name from "ABC Category" to "ABC Category Override".
    [perldigious]: Being the ignorant one, my initial reaction to that is, "that's sort of a dick move, a lot of people like me expect column names like that to stay the same, why the hell would you change them like that for seemingly no good reason?"
    [perldigious]: Or is my irritation/ frustration well founded?
    [Corion]: perldigious: That seems to be more the export and likely it's the recipients of that export that like the titles changes
    [Corion]: ... "changed"

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