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some questions about manipulating a $

some questions about manipulating a $

some questions about manipulating a $

I have some questions about manipulating the contents of a $:

- I’m trying to standardize the look of a nummeric variable field.

The input can be for example:


they all should finally look like:


I can only think of getting  the length of the string and  use substring to clear potential dots etc. then reverse the string and insert dots after every 3 digits and reverse it again but probably this is much easier done in Perl?

- What is the quickest way to clear all characters except the digits from a string?

- Let’s say you have a datafile with a nummer of fields seperated by “:”.  You don’t want to store a new record to this file with a variable with “:” in it as it will mess up the record when reading it from the datafile. What is the fastest way to check all fields for “:” and replace it with for example “;” before saving it?


RE: some questions about manipulating a $

' sounds to me like you need a little regex replacement stuff......

$str = '10,000,000';
$str =~ s/\D//g; # replace all non-digits with null

Second item,

$str = 'some text with : colons embedded : ';
$str =~ s/:/\;/g; # replace all ':'s with ';'s.  
              # Must escape ';' to keep Perl from
              # ending statement on ';'.

'hope this helps.

keep the rudder amid ship and beware the odd typo

RE: some questions about manipulating a $


I hope this too help you .

$number= reverse($number);
$number=~ s/(\d\d\d)(?=\d)(?!\d*\.)/$1,/g;
print $number;

RE: some questions about manipulating a $

Thanks both. Works great!

Does anybody knows a good site for more info about this sort of stuff. I checked some documentation but what I found was totally not useful.

I would like to get more info about this for doing a search through a data file with fields that match a certain number of characters and that sort of stuff.


RE: some questions about manipulating a $

At www.perl.com, via their search, choosing 'regular expressions' from the pull down, you get this list of resources.....


The last link on that page, 'Regular Expressions', is a pdf of a chapter from a book that does a pretty good job.

Additionally, if you have some specific regex problem, feel free to post it.  I'm sure some one will find one of the 'more than one ways to do it'.

'hope this helps.

keep the rudder amid ship and beware the odd typo

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