juman said:
> I have som strings that I want to clean up. They can contain digits,
> some special characters (white space etc) and a comma and all I want to
> keep is the digits and the comma? Any idea how I could do this?
>
>From Learning Perl Chp9:
"9.6.1. Global Replacements with /g
As you may have noticed in a previous example, s/// will make just one
replacement, even if others are possible. Of course, that's just the
default. The /g modifier tells s/// to make all possible
nonoverlapping[206] replacements:
[206]It's nonoverlapping because each new match starts looking just
beyond the latest replacement.
$_ = "home, sweet home!";
s/home/cave/g;
print "$_\n"; # "cave, sweet cave!"
A fairly common use of a global replacement is to collapse whitespace;
that is, to turn any arbitrary whitespace into a single space:
$_ = "Input data\t may have extra whitespace.";
s/\s+/ /g; # Now it says "Input data may have extra whitespace."
Once we show collapsing whitespace, everyone wants to know about stripping
leading and trailing whitespace. That's easy enough, in two steps:[207]
[207]It could be done in one step, but this way is better.
s/^\s+//; # Replace leading whitespace with nothing
s/\s+$//; # Replace trailing whitespace with nothing"
Now you know what to use, just figure the regex ;-)
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