From: perl-win32-users-boun...@listserv.activestate.com
[mailto:perl-win32-users-boun...@listserv.activestate.com] On Behalf Of Greg
Aiken
Sent: 08 March 2012 15:32
To: perl-win32-users@listserv.activestate.com
Subject: pattern match 'or' operator |
> in pdf files evidently there are two different ways one may specify the
> 'length' operator
>
> sometimes one sees;
> \Length
>
> while at other times, the letter L is sufficient;
> \L
>
> i am wanting to do a pattern match for a line of data in a pdf file where i
> am looking to match EITHER \L or
> \Length
>
> is there a way that using ONE pattern match I can say achieve something like
> this?
>
> in pseudo code:
> $record =~ /'Length' | 'L'/
> (where the precedence would be towards the first thing matched, in this case,
> 'Length')
>
> the only example ive seen which uses the or operator (|), shows this working
> for a single character only, as
> in:
> $record =~ /a|b/
>
> ive never seen an example quite like what I would like to do...
>
> if it cant be currently done, perhaps a future enhancement to regex could be
> in order, by adding a new
> enclosing 'literal delimiter', something like this could one day work
> (forgive me here, im just thinking
> outside of the box - only as i dont know any better);
>
> $record =~ /'Length' | 'L'/
>
> thanks for helping me with my understanding of this.
Assuming trailing white space, then qr{\\L(ength)?\b} should match both.
However, depending on what you are trying to achieve, it might be advisable to
use a module that knows how to parse PDF files.
HTH
--
Brian Raven
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