Christ That's certainly 1 way ;)
-----Original Message-----
From: John W. Krahn [mailto:[EMAIL PROTECTED]
Sent: 03 September 2007 16:11
To: Perl beginners
Subject: Re: Regex help
Beginner wrote:
Hi,
Hello,
I am trying to come up with a regex to squash multiple commas into
one. The line I am working on looks like this:
SPEED OF LIGHT, , LIGHT SPEED,TRAVEL,TRAVELLING, ,
DANGER,DANGEROUS,PHYSICAL, , CONCEPT,CONCEPTS, , , , , , , , , ,
There are instances of /,\s{1,},/ and /,,/
The bit that I am struggling with is finding a way to get a use a
multiplier for the regex /,\s+/ but I have to be careful not to remove
single entries. I guess the order of my substitutions is important
here.
$ perl -le'
$_ = q[SPEED OF LIGHT, , LIGHT SPEED,TRAVEL,TRAVELLING, ,
DANGER,DANGEROUS,PHYSICAL, , CONCEPT,CONCEPTS, , , , , , , , , , ]; >
print; s/,\s*(?=,)//g; print; '
SPEED OF LIGHT, , LIGHT SPEED,TRAVEL,TRAVELLING, ,
DANGER,DANGEROUS,PHYSICAL, , CONCEPT,CONCEPTS, , , , , , , , , , SPEED OF
LIGHT, LIGHT SPEED,TRAVEL,TRAVELLING, DANGER,DANGEROUS,PHYSICAL,
CONCEPT,CONCEPTS,
$ perl -le'
$_ = q[SPEED OF LIGHT, , LIGHT SPEED,TRAVEL,TRAVELLING, ,
DANGER,DANGEROUS,PHYSICAL, , CONCEPT,CONCEPTS, , , , , , , , , , ]; print;
$_ = join ",", grep /\S/, split /,/; print; '
SPEED OF LIGHT, , LIGHT SPEED,TRAVEL,TRAVELLING, ,
DANGER,DANGEROUS,PHYSICAL, , CONCEPT,CONCEPTS, , , , , , , , , , SPEED OF
LIGHT, LIGHT SPEED,TRAVEL,TRAVELLING, DANGER,DANGEROUS,PHYSICAL,
CONCEPT,CONCEPTS
John
--
Perl isn't a toolbox, but a small machine shop where you can special-order
certain sorts of tools at low cost and
in short order. -- Larry Wall
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