Re: perl regular expression grammar

ralph@inputplus.demon.co.uk (Ralph Corderoy)
18 Jul 2001 19:59:33 -0400

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From: ralph@inputplus.demon.co.uk (Ralph Corderoy)
Newsgroups: comp.compilers
Date: 18 Jul 2001 19:59:33 -0400
Organization: InputPlus Ltd.
References: 01-07-080
Keywords: syntax
Posted-Date: 18 Jul 2001 19:59:33 EDT

Hi,


> One area I am >confused is the "\c[" control character (described at
> http://www.perldoc.com/perl5.6/pod/perlre.html).
>
> <controlchar> ::= "c["


Yes, the man page looks poor to me. In the past it used to explain
that \ca meant Control-A, i.e. ASCII SOH. So \c[ means ASCII ESC (27)
since [ is 0x5b and 0x5b & ~0x40 == 0x1b. What I'm trying to say is it
doesn't just work for [, that's just an example, other characters can
follow.




Ralph.

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