Hi coltman,

You can iterate over a given string using the /g (global) quantifier, as well as regex captures: 

use strict;
use warnings;

my $string = "ASBSDEC 34 GADVVEEVEETTE 56 IOEOREAK GKJEOG EFEAF 1090 D
+AFFEE 376";

my $max;  # This is undefined until set
while ($string =~ /(\d+)/g) {
    if (!defined($max) or $max < $1) {
        $max = $1;
    }
}

print "Max value is $max\n";

[download]

Or you could make it into a subroutine (eg. max_val) like so: 

use strict;
use warnings;

my $string = "ASBSDEC 34 GADVVEEVEETTE 56 IOEOREAK GKJEOG EFEAF 1090 D
+AFFEE 376";
my $max = max_val($string);
print "Max value is $max\n";


sub max_val {
    my $str = shift;
    my $max;
    while ($string =~ /(\d+)/g) {
        if (!defined($max) or $max < $1) {
            $max = $1;
        }
    }
    return $max;        # This will be undefined if no integer found
}

[download]

And, of course, you can read more about regular expressions with perlretut and perlre.

Update:  Oh, and perlrequick.  I always forget that one.
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/

In reply to Re: Help with regex, how to get the largest integer in a string? by liverpole
in thread Help with regex, how to get the largest integer in a string? by coltman

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