regexp help needed

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Fellow Monks!
I need your wisdom in the world of regular expressions.
What I want to do is this. Out of the following string:

#total mean for 530.2 nm = 411.67 W/m**2, dev= 0.2%

I need to extract the highlighted numeric value only.
Although I am, in this instance looking for a quick and efficient solution to this scenario, I would like to learn more. So... if anyone has an excellent link to a simple yet powerful regex tutorial I would greatly appreciate it.
And.... no, this is definitely not homework. Thank you in advance for your wisdom, for at the moment my knowledge of regexes is limited, soon I hope for it to grow.

Comment on regexp help needed

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Re: regexp help needed by ikegami (Patriarch) on Oct 17, 2006 at 15:13 UTC
Sorry, the only link I have is to the Perl docs, perlre. `my ($mean) = $str =~ /total mean for ([-+0-9.]+)/;` [download]	[reply] [d/l]
Re: regexp help needed by shmem (Chancellor) on Oct 17, 2006 at 15:16 UTC
There's also perlretut :-)	[reply]
Re: regexp help needed by davorg (Chancellor) on Oct 17, 2006 at 15:45 UTC
I recommend Regexp::Common. `use Regexp::Common qw(number); $_ = '#total mean for 530.2 nm = 411.67 W/m*2, dev= 0.2%'; if (/$RE{num}{real}{-keep}/) { print "$1\n"; }` [download] -- <http://dave.org.uk> "The first rule of Perl club is you do not talk about Perl club."* -- Chip Salzenberg	[reply] [d/l]