Checking if your kit is complete...
Looks good
Writing Makefile for YAPE::Regex::Explain
cp Explain.pm blib/lib/YAPE/Regex/Explain.pm
Manifying blib/man3/YAPE::Regex::Explain.3
PERL_DL_NONLAZY=1 /home/cpanrun/pa-risc1.1/build/5.8.2/bin/perl "-Iblib/lib" "-Iblib/arch" test.pl
1..1
ok 1
The regular expression:

(?-imsx: foo (?(?{ $x })(?!)) b | a{2} )

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):
----------------------------------------------------------------------
   foo                     ' foo '
----------------------------------------------------------------------
  (?                       if the following assertion is true:
----------------------------------------------------------------------
    (?{ $x })                run this block of Perl code
----------------------------------------------------------------------
                            then:
----------------------------------------------------------------------
    (?!)                     fail
----------------------------------------------------------------------
   |                        else:
----------------------------------------------------------------------
                             succeed
----------------------------------------------------------------------
  )                        end of conditional
----------------------------------------------------------------------
   b                       ' b '
----------------------------------------------------------------------
 |                        OR
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
  a{2}                     'a' (2 times)
----------------------------------------------------------------------
                           ' '
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
(?x-ims:               # group, but do not capture (disregarding
                       # whitespace and comments) (case-sensitive)
                       # (with ^ and $ matching normally) (with . not
                       # matching \n):

  \ foo\                 # ' foo '

  (?                     # if the following assertion is true:

    (?{ $x })              # run this block of Perl code

                          # then:

    (?!)                   # fail

   |                      # else:

                           # succeed

  )                      # end of conditional

  \ b\                   # ' b '

 |                      # OR

  \                      # ' '

  a{2}                   # 'a' (2 times)

  \                      # ' '

)                      # end of grouping

(?x-ims:

  \ foo\

  (?

    (?{ $x })


    (?!)

   |


  )

  \ b\

 |

  \

  a{2}

  \

)

Installing /home/cpanrun/pa-risc1.1/build/5.8.2/lib/site_perl/5.8.2/YAPE/Regex/Explain.pm
Installing /home/cpanrun/pa-risc1.1/build/5.8.2/man/man3/YAPE::Regex::Explain.3
Appending installation info to /home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/PA-RISC1.1-thread-multi/perllocal.pod