perl -MYAPE::Regex::Explain -E 'say YAPE::Regex::Explain->new("\b (MODULE \s+ [A-Z]+[0-9]+) \s* [(] .+? [)]")->explain'

##</code><code>##

The regular expression:

(?-imsx: (MODULE s+ [A-Z]+[0-9]+) s* [(] .+? [)])

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
                           '  '
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    MODULE                   'MODULE '
----------------------------------------------------------------------
    s+                       's' (1 or more times (matching the most
                             amount possible))
----------------------------------------------------------------------
                             ' '
----------------------------------------------------------------------
    [A-Z]+                   any character of: 'A' to 'Z' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
    [0-9]+                   any character of: '0' to '9' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
  s*                       's' (0 or more times (matching the most
                           amount possible))
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
  [(]                      any character of: '('
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
  .+?                      any character except \n (1 or more times
                           (matching the least amount possible))
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
  [)]                      any character of: ')'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

##</code><code>##

#!/usr/bin/env perl

use strict;
use warnings;

use YAPE::Regex::Explain;

my $re = qr/ \b (MODULE \s+ [A-Z]+[0-9]+) \s* [(] .+? [)] /x;

my $exp = YAPE::Regex::Explain->new($re)->explain;

print $exp;

exit;

##</code><code>##

The regular expression:

(?x-ims: \b (MODULE \s+ [A-Z]+[0-9]+) \s* [(] .+? [)] )

matches as follows:
  
NODE                     EXPLANATION
----------------------------------------------------------------------
(?x-ims:                 group, but do not capture (disregarding
                         whitespace and comments) (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n):
----------------------------------------------------------------------
  \b                       the boundary between a word char (\w) and
                           something that is not a word char
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    MODULE                   'MODULE'
----------------------------------------------------------------------
    \s+                      whitespace (\n, \r, \t, \f, and " ") (1
                             or more times (matching the most amount
                             possible))
----------------------------------------------------------------------
    [A-Z]+                   any character of: 'A' to 'Z' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
    [0-9]+                   any character of: '0' to '9' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  [(]                      any character of: '('
----------------------------------------------------------------------
  .+?                      any character except \n (1 or more times
                           (matching the least amount possible))
----------------------------------------------------------------------
  [)]                      any character of: ')'
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------