Re: grep for lines containg two variables

Does one string always preceed the other string? Or can they be in any order?

If I've got my head screwed on correctly (always a doubtful proposition,) some of the solutions above will work in both cases and other solutions will only work if $string1 appears before $string2.

From ikegami's post:

Works in any order

@interesting_lines = grep /$string1/, grep /$string2/, @log;
[download]

Works in any order

@interesting_lines = grep /$string1/ && /$string2/, @log;
[download]

Only works if $string1 preceeds $string2

@interesting_lines = grep /^(?=.*$string1)(?=.*$string2)/, @log;
[download]

Or am I a total moron?

Comment on Re: grep for lines containg two variables Select or Download Code

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Re^2: grep for lines containg two variables by Roy Johnson (Monsignor) on Dec 07, 2005 at 19:02 UTC
Because it's done with lookaheads, the last example works with strings in either order. That is, in fact, why it is done with lookaheads. In my mind, lookaheads like this are the "and" that complements alternation's "or" in regexen. Caution: Contents may have been coded under pressure.	[reply]
Re^3: grep for lines containg two variables by pileofrogs (Priest) on Dec 07, 2005 at 21:12 UTC
Woah! Thanks!	[reply]