Message-ID: <Pine.LNX.4.63.0505231142520.28449@dns.unife.it>
Date: 2005-05-23T09:46:09Z
From: Josef Eschgfaeller
Subject: Backslash
Why sometimes one has to put a double
backslash in regular expressions, but
often simple backslashes work too?
Is only a \ required for giving a
metacharacter its usual meaning?
---------------------------------------
u=grep('\\{[\\-u]x',a,perl=T)
# equivalent to
u=grep('\{[\-u]x',a,perl=T)
# but
u=grep('\w',a,perl=T)
# is not correct and requires
u=grep('\\w',a,perl=T)
---------------------------------------
Josef Eschgf??ller
--
Josef Eschgf??ller
Dipartimento Matematico
Universita' di Ferrara
http://felix.unife.it