... can you explain to me how to read the patterns ...

Because parv's regex contains nothing that is not supported by Perl version 5.6, the YAPE::Regex::Explain module can help.

c:\@Work\Perl\monks>perl -wMstrict -le
"use YAPE::Regex::Explain;
 ;;
 my $rx = qr{ \b (MODULE \s+ [A-Z]+[0-9]+) \s* [(] .+? [)] }x;
 ;;
 print YAPE::Regex::Explain->new($rx)->explain;
"
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
----------------------------------------------------------------------
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