Re: String manipulation

Something like this may do the job:

use strict;
use warnings;
use feature qw/ :5.10 /;

my @str = ("j    k l         foobar", "foobar", "jkl foobar", "1 2 3",
+ "jk l foobar", "foobar j k l", "foobar j kl", "           ", " ", "j
+ jk foobar", "j k jk foobar", "j k l");

my $rx = qr/^((?:\w(?:\s+|\z))*)(.*)/;

for my $str (@str){
  my ($i,$s) = $str =~ /$rx/;
  $i =~ s/\s+//g;
  say $i ? join " ",$i,$s : $s;
}
[download]

Outputs:

jkl foobar
foobar
jkl foobar
123
jk l foobar
foobar j k l
foobar j kl


j jk foobar
jk jk foobar
jkl
[download]

citromatik

Comment on Re: String manipulation Select or Download Code

Replies are listed 'Best First'.
Re^2: String manipulation by abhy (Novice) on Jun 24, 2009 at 10:42 UTC
If I am not asking for too much, can you please expand the regex with comments?	[reply]
Re^3: String manipulation by citromatik (Curate) on Jun 24, 2009 at 11:22 UTC
Sure: `my $rx = qr/ ^ # At the beginning of the string ( # Capture in $1 (?: # Paren for grouping (don't capture in $2) \w # match a "wordy" character (?: # paren for grouping, \s+\|\z # match at least one space or the end of the + string ) )* # zero or more times ) # end of capture $1 (.) # and match what comes after storing it in $ +2 /x # allow these comments ;` [download] The rationale is to match at the beginning all the one-character strings, storing them in $1. The rest of the input will be catched in $2 citromatik*	[reply] [d/l]
Re^3: String manipulation by Limbic~Region (Chancellor) on Jun 24, 2009 at 13:03 UTC
abhy, If you don't know about YAPE::Regex::Explain, it is worth a look. I don't think it has been updated to take into consideration the new regex doodads in Perl 5.10 but it should be helpful regardless. Cheers - L~R	[reply]


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