On Oct 16, 2012, at 8:10 AM, xiyoulaoyuanjia wrote:
> hi listers:
> i am very sorry to say that i recently get in trouble with a Regular !
> i want math the middle of 123 and 456 string!
> the Test Case below:
> ------------------------------------------
> 123faf456fafafafa----->faf
>
> 33312323ff456456--->23ff
>
> 9999912344444456777777456-->44444
> -------------------------------------------------
> i have try a regular but it get trouble!
> can anyone help me?
The best way to get help with a Perl problem is to post a minimal program that
demonstrates the problem you are having.
Here is a program that might help:
#!/usr/bin/perl
use strict;
use warnings;
my @x = ( '123faf456fafafafa', '33312323ff456456',
'9999912344444456777777456' );
for my $s ( @x ) {
if( $s =~ m{ 123 (.*?) 456 }x ) {
print "$s -> $1\n";
}else{
print "No match\n";
}
}
which produces:
123faf456fafafafa -> faf
33312323ff456456 -> 23ff
9999912344444456777777456 -> 44444
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