#!/usr/bin/perl -w

use strict;

# open(DATA,"file.txt") or die $!;  # I am using DATA handle but you can open a file to read contents too.

my %functions;
while (<DATA>) {
	chomp;
	my @functxt = ();
	my $desc = ();
	if (/STANDARD/)	{
		@functxt = split /\s+/;
		$desc = <DATA>;
		$functions{pop(@functxt)} = $desc;    # assuming last word is function name
	}
}

print +($_, " : ", $functions{$_}, $/) for (keys %functions); 
__DATA__
# STANDARD func1 
func1 does something funny
blah
blah
ok
junk text
# STANDARD func2 
func2 does something useful

# STANDARD func3 
func3 is a math function


##</code><code>##

func1 : func1 does something funny        
func3 : func3 is a math function                                
func2 : func2 does something useful