Re: Any LPEG tutorial for laymen ?

[Philipp Janda <siffiejoe@...>]

Hi!

Am 25.09.2013 06:50 schröbte David Crayford:
> Thanks. This is how dumbstruck I am WRT pattern matching. I want to
> parse the following piece of netstat output
>
> SKRBKDC  00000099 UDP
>    Local Socket:   172.17.69.30..464
>    Foreign Socket: *..*
>
> The top line is the user, connection id and state. All I want to do is
> capture three whitespace seperated words.
>
> In REXX I would do this:
>
> parse var line userid connid state
>
> What is the most succinct way of doing something similar in Lua?

print( line:match( "(%w+)%s+(%w+)%s+(%w+)" ) )

%w matches a single "word"-character (letters, numbers, and _).
%w+ means: at least one of those, and as much as possible.
(%w+) means: capture the match (copy the matching substring to the 
return values of `line:match` (if the whole match succeeds)).
%s matches a single whitespace character (not just space, but tab, and 
newline, etc. as well).
%s+ means: match at least one whitespace, but as much as possible at 
that position.

Philipp