Date:         Fri, 31 Mar 2006 13:01:16 -0500
Reply-To:     evilpettingzoo97@AOL.COM
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Ken Borowiak <evilpettingzoo97@AOL.COM>
Subject:      Re: How to Under the follow Perl
Comments: To: jamespannyc@YAHOO.COM
In-Reply-To:  <200603311706.k2VGFZ9I002958@mailgw.cc.uga.edu>
Content-Type: text/plain; charset="us-ascii"; format=flowed

James,

In example 1 where you find \( in the PAREN regex, where the \
character is masking the open parens character.
In example 3 you find \((, where \( is the same as above and the second
( starts the beginning of a capture buffer used later in the example.

Does this answer your first question?

HTH,
Ken

-----Original Message-----
From: James Pan <jamespannyc@YAHOO.COM>
To: SAS-L@LISTSERV.UGA.EDU
Sent:         Fri, 31 Mar 2006 12:06:28 -0500
Subject: How to Under the follow Perl

  Hi,

I am learning Perl through SAS website.

Under Pattern Matching Using SAS Regular Expressions (RX) and Perl
Regular
Expressions (PRX)

Example 3: Extracting a Substring from a String

         paren = "\(([2-9]\d\d)\) ?[2-9]\d\d-\d\d\d\d";
         dash = "([2-9]\d\d)-[2-9]\d\d-\d\d\d\d";

1. Why paren and dash is different from Example 1? Why need \(( rather
than
just |( ?

2. Use the PRXPAREN function to determine which submatch to use.
PRXPAREN
returns the last submatch that was matched. If an area code matches the
form
(XXX), PRXPAREN returns the value 2. If an area code matches the form
XXX,
PRXPAREN returns the value 4. How to get 2 and 4? Could anyone explain
it in
detail? I can not get there.

Thanks,
James