Re: LPeg and whitespace removal

[Joshua Jensen <jjensen@...>]

Okay, that's excellent!  Thanks for both responses.  I was running into 
troubles, because I've been trying to do something slightly more 
complicated.

print(p:match('*ab***cd**,*This**is**a***sentence,***ijk**lm******'))

So, I want to separate the comma separated tokens, trim the left and 
right whitespace, and preserve the white space in the middle.

Any ideas?

Thanks.

Josh

Jose Luis Hidalgo wrote:
> ws = lpeg.P('*')
> sep = lpeg.P(',')
> elem = ws^0 * (lpeg.C( (1 - (sep+ws) )^0)) * ws^0
> p = elem * (sep * elem)^0
>
> 2007/4/12, Joshua Jensen <jjensen@workspacewhiz.com>:
> > As my first attempt at using LPeg, I took the Splitting a String example
> > and wanted to extend it to filter out whitespace on either side of the
> > string.  All whitespace (represented as a visible *) is removed from the
> > pattern below except the whitespace at the end.  I understand why it
> > doesn't work; I don't understand how to make an elegant fix for it.  I
> > tried all kinds of approaches without success.