Re^2: how to place rows information into column (2)

wouldn't try to pattern match the scientific float... you could, but I think it's over-kill.

Do you really have any idea what does /^(\S+)\s+(\S*)/o do?

/^(\S+)\s+(\S*)/o and print FH "K: ", $1, "V: ", $2, "\n" while <DATA>
+;
[download]

where <DATA> contains over 22000 lines - less than a second
on my old (less than 1800 Mh cpu) home machine.

Comment on Re^2: how to place rows information into column (2) Select or Download Code

Replies are listed 'Best First'.
Re^3: how to place rows information into column (2) by osunderdog (Deacon) on Feb 02, 2005 at 23:35 UTC
`/^(\S+)\s+(\S)/o` Matches one or more non-whitespace characters, followed by one or more whitespace characters, followed by 0 or more non-whitespace characters. The `o` indicates 'compile pattern only once'. from `perldoc perlop` `If you want such a pattern to be compiled only once, add a "/o" after +the trailing delimiter. This avoids expensive run-time recompilation +s, and is useful when the value you are interpolating won’t change ov +er the life of the script.` [download] The parens capture those non-whitspace matches into variables `$1` and `$2` for use within the scope. "Look, Shiny Things!"* is not a better business strategy than compatibility and reuse.	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: how to place rows information into column (2)
by osunderdog (Deacon) on Feb 02, 2005 at 23:35 UTC

/^(\S+)\s+(\S*)/o

Matches one or more non-whitespace characters, followed by one or more whitespace characters, followed by 0 or more non-whitespace characters. The o indicates 'compile pattern only once'.

from perldoc perlop

 
If you want such a pattern to be compiled only once, add a "/o" after 
+the trailing delimiter.  This avoids expensive run-time recompilation
+s, and is useful when the value you are interpolating won’t change ov
+er the life of the script.
[download]

The parens capture those non-whitspace matches into variables $1 and $2 for use within the scope.

"Look, Shiny Things!" is not a better business strategy than compatibility and reuse.

[reply]
[d/l]
[select]