Re: meaning for the code

can any one explain me what the following code do. ($whole,$deci) = /(?:(\d*)\.?(\d+))|(?:(\d+)\.?(\d*))/;

Yes. The pattern matches either (\d*)\.?(\d+) or (\d+)\.?(\d*). The variable $whole is assigned the contents of the first set of capturing parentheses ((\d*) or (\d+)) and the variable $deci is assigned the contents of the second set of capturing parentheses ((\d+) or (\d*)).

Update: Thanks ikegami. It looks like I couldn't get anything right yesterday. :-(

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Re^2: meaning for the code by ikegami (Patriarch) on Mar 12, 2008 at 17:10 UTC
No way! The variable `$whole` is assigned the contents of the first set of capturing parentheses (the first `(\d)`). The variable `$deci` is assigned the contents of the second set of capturing parentheses (the first `(\d+)`). `/(?:(\d)\.?(\d+))\|(?:(\d+)\.?(\d*))/ ^^^^^ ^^^^^ Always Always $whole $deci` [download] Should the second alternation match — it never will — then `$whole` and `$deci` will be undef.	[reply] [d/l] [select]

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Re^2: meaning for the code
by ikegami (Patriarch) on Mar 12, 2008 at 17:10 UTC

No way!

The variable $whole is assigned the contents of the first set of capturing parentheses (the first (\d*)).
The variable $deci is assigned the contents of the second set of capturing parentheses (the first (\d+)).

/(?:(\d*)\.?(\d+))|(?:(\d+)\.?(\d*))/
    ^^^^^   ^^^^^
    Always  Always
    $whole  $deci
[download]

Should the second alternation match — it never will — then $whole and $deci will be undef.

[reply]
[d/l]
[select]