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
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