#!/usr/bin/perl -w

use strict;

my $format;
while (<DATA>) {
    my $line = $_;
    # this line has alphbet, try to seperate
    if ($line =~ /[a-zA-Z\d]/) {
        LINE: while (1) {
            # (([\x81-\xfe][\x40-\xfe])*) greedy match on chinese.
            # line starts with chinese
             if ($line =~ /(([\x81-\xfe][\x40-\xfe])*)/ && $1) {
                my $e = $1;
                # update line
                $line = $';                
                $format .= ($line=~ /^\s/) ? $e : $e." ";
            } elsif ($line =~ /(.*?)([\x81-\xfe][\x40-\xfe])/) {
                # line starts with non-chinese chars
                my $e = $1;
                # the second match eats one chinese char, so get it ba
+ck.
                $line = $2.$';
                # add space after english char if it isn't ended with 
+space.
                $format .= ($e=~/\s$/) ? $e : $e." ";
            } else {
                $format .= $line;
                last LINE;
            }
        }
    } else {
        $format .= $line;
    }
}

print $format;

__DATA__

在 2004 年7月的开源大会时能比CPython更快的执行Python的字节码
“Perl现在生机勃勃
Perl 6被建议不应只作为Perl的新的实现
perl 5.8.x,仍然生机勃勃,Jarkko Hietaniemi今年的早些时候把
在2003年10月，发布了

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In reply to format text which mixed english and chinese characters. by Qiang

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